county string | data_as_of string | derived_fields list | id string | nonattainment_area_name string | pollutant_naaqs string | row_id string | source string | source_quote string | state string | url string | verified_fields list | partial_county string |
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Allegan County | September 30, 2026 | [
"partial_county",
"row_id",
"state"
] | 8-hour-ozone-2015-allegan-county-michigan-allegan-county-mi-serious | Allegan County, MI - (Serious) | 8-Hour Ozone (2015) | allegan-county-mi-serious | https://www3.epa.gov/airquality/greenbook/ancl.html | Allegan County | 8-Hour Ozone (2015) | * | Allegan County, MI - (Serious) | MICHIGAN | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2015-allegan-county-michigan-allegan-county-mi-serious/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | yes |
Carbon County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2008-carbon-county-pennsylvania-allentown-bethlehem-easton-pa-marginal | Allentown-Bethlehem-Easton, PA - (Marginal) | 8-Hour Ozone (2008) | allentown-bethlehem-easton-pa-marginal | https://www3.epa.gov/airquality/greenbook/ancl.html | Carbon County | 8-Hour Ozone (2008) | | Allentown-Bethlehem-Easton, PA - (Marginal) | PENNSYLVANIA | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2008-carbon-county-pennsylvania-allentown-bethlehem-easton-pa-marginal/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Lehigh County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2008-lehigh-county-pennsylvania-allentown-bethlehem-easton-pa-marginal | Allentown-Bethlehem-Easton, PA - (Marginal) | 8-Hour Ozone (2008) | allentown-bethlehem-easton-pa-marginal | https://www3.epa.gov/airquality/greenbook/ancl.html | Lehigh County | 8-Hour Ozone (2008) | | Allentown-Bethlehem-Easton, PA - (Marginal) | PENNSYLVANIA | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2008-lehigh-county-pennsylvania-allentown-bethlehem-easton-pa-marginal/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Northampton County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2008-northampton-county-pennsylvania-allentown-bethlehem-easton-pa-marginal | Allentown-Bethlehem-Easton, PA - (Marginal) | 8-Hour Ozone (2008) | allentown-bethlehem-easton-pa-marginal | https://www3.epa.gov/airquality/greenbook/ancl.html | Northampton County | 8-Hour Ozone (2008) | | Allentown-Bethlehem-Easton, PA - (Marginal) | PENNSYLVANIA | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2008-northampton-county-pennsylvania-allentown-bethlehem-easton-pa-marginal/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Amador County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2015-amador-county-california-amador-county-ca-marginal | Amador County, CA - (Marginal) | 8-Hour Ozone (2015) | amador-county-ca-marginal | https://www3.epa.gov/airquality/greenbook/ancl.html | Amador County | 8-Hour Ozone (2015) | | Amador County, CA - (Marginal) | CALIFORNIA | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2015-amador-county-california-amador-county-ca-marginal/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Anne Arundel County | September 30, 2026 | [
"partial_county",
"row_id",
"state"
] | sulfur-dioxide-2010-anne-arundel-county-maryland-anne-arundel-county-and-baltimore-county-md | Anne Arundel County and Baltimore County, MD | Sulfur Dioxide (2010) | anne-arundel-county-and-baltimore-county-md | https://www3.epa.gov/airquality/greenbook/ancl.html | Anne Arundel County | Sulfur Dioxide (2010) | * | Anne Arundel County and Baltimore County, MD | MARYLAND | https://referencesource.org/nonattainment-county-designations-by-pollutant/sulfur-dioxide-2010-anne-arundel-county-maryland-anne-arundel-county-and-baltimore-county-md/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | yes |
Baltimore County | September 30, 2026 | [
"partial_county",
"row_id",
"state"
] | sulfur-dioxide-2010-baltimore-county-maryland-anne-arundel-county-and-baltimore-county-md | Anne Arundel County and Baltimore County, MD | Sulfur Dioxide (2010) | anne-arundel-county-and-baltimore-county-md | https://www3.epa.gov/airquality/greenbook/ancl.html | Baltimore County | Sulfur Dioxide (2010) | * | Anne Arundel County and Baltimore County, MD | MARYLAND | https://referencesource.org/nonattainment-county-designations-by-pollutant/sulfur-dioxide-2010-baltimore-county-maryland-anne-arundel-county-and-baltimore-county-md/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | yes |
Arecibo Municipio | September 30, 2026 | [
"partial_county",
"row_id",
"state"
] | lead-2008-arecibo-municipio-puerto-rico-arecibo-pr | Arecibo, PR | Lead (2008) | arecibo-pr | https://www3.epa.gov/airquality/greenbook/ancl.html | Arecibo Municipio | Lead (2008) | * | Arecibo, PR | PUERTO RICO | https://referencesource.org/nonattainment-county-designations-by-pollutant/lead-2008-arecibo-municipio-puerto-rico-arecibo-pr/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | yes |
Armstrong County | September 30, 2026 | [
"partial_county",
"row_id",
"state"
] | sulfur-dioxide-1971-armstrong-county-pennsylvania-armstrong-county-madison-mahoning-boggs-washington-pine-pa | Armstrong County: Madison, Mahoning, Boggs, Washington, Pine, PA | Sulfur Dioxide (1971) | armstrong-county-madison-mahoning-boggs-washington-pine-pa | https://www3.epa.gov/airquality/greenbook/ancl.html | Armstrong County | Sulfur Dioxide (1971) | * | Armstrong County: Madison, Mahoning, Boggs, Washington, Pine, PA | PENNSYLVANIA | https://referencesource.org/nonattainment-county-designations-by-pollutant/sulfur-dioxide-1971-armstrong-county-pennsylvania-armstrong-county-madison-mahoning-boggs-washington-pine-pa/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | yes |
Anne Arundel County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2008-anne-arundel-county-maryland-baltimore-md-moderate | Baltimore, MD - (Moderate) | 8-Hour Ozone (2008) | baltimore-md-moderate | https://www3.epa.gov/airquality/greenbook/ancl.html | Anne Arundel County | Sulfur Dioxide (2010) | * | Anne Arundel County and Baltimore County, MD | 8-Hour Ozone (2008) | | Baltimore, MD - (Moderate) | MARYLAND | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2008-anne-arundel-county-maryland-baltimore-md-moderate/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Baltimore city | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2008-baltimore-city-maryland-baltimore-md-moderate | Baltimore, MD - (Moderate) | 8-Hour Ozone (2008) | baltimore-md-moderate | https://www3.epa.gov/airquality/greenbook/ancl.html | Baltimore city | 8-Hour Ozone (2008) | | Baltimore, MD - (Moderate) | MARYLAND | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2008-baltimore-city-maryland-baltimore-md-moderate/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Baltimore County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2008-baltimore-county-maryland-baltimore-md-moderate | Baltimore, MD - (Moderate) | 8-Hour Ozone (2008) | baltimore-md-moderate | https://www3.epa.gov/airquality/greenbook/ancl.html | Baltimore County | Sulfur Dioxide (2010) | * | Anne Arundel County and Baltimore County, MD | 8-Hour Ozone (2008) | | Baltimore, MD - (Moderate) | MARYLAND | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2008-baltimore-county-maryland-baltimore-md-moderate/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Carroll County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2008-carroll-county-maryland-baltimore-md-moderate | Baltimore, MD - (Moderate) | 8-Hour Ozone (2008) | baltimore-md-moderate | https://www3.epa.gov/airquality/greenbook/ancl.html | Carroll County | 8-Hour Ozone (2008) | | Baltimore, MD - (Moderate) | MARYLAND | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2008-carroll-county-maryland-baltimore-md-moderate/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Harford County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2008-harford-county-maryland-baltimore-md-moderate | Baltimore, MD - (Moderate) | 8-Hour Ozone (2008) | baltimore-md-moderate | https://www3.epa.gov/airquality/greenbook/ancl.html | Harford County | 8-Hour Ozone (2008) | | Baltimore, MD - (Moderate) | MARYLAND | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2008-harford-county-maryland-baltimore-md-moderate/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Howard County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2008-howard-county-maryland-baltimore-md-moderate | Baltimore, MD - (Moderate) | 8-Hour Ozone (2008) | baltimore-md-moderate | https://www3.epa.gov/airquality/greenbook/ancl.html | Howard County | 8-Hour Ozone (2008) | | Baltimore, MD - (Moderate) | MARYLAND | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2008-howard-county-maryland-baltimore-md-moderate/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Anne Arundel County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2015-anne-arundel-county-maryland-baltimore-md-serious | Baltimore, MD - (Serious) | 8-Hour Ozone (2015) | baltimore-md-serious | https://www3.epa.gov/airquality/greenbook/ancl.html | Anne Arundel County | Sulfur Dioxide (2010) | * | Anne Arundel County and Baltimore County, MD | 8-Hour Ozone (2008) | | Baltimore, MD - (Moderate) | 8-Hour Ozone (2015) | | Baltimore, MD - (Serious) | MARYLAND | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2015-anne-arundel-county-maryland-baltimore-md-serious/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Baltimore city | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2015-baltimore-city-maryland-baltimore-md-serious | Baltimore, MD - (Serious) | 8-Hour Ozone (2015) | baltimore-md-serious | https://www3.epa.gov/airquality/greenbook/ancl.html | Baltimore city | 8-Hour Ozone (2008) | | Baltimore, MD - (Moderate) | 8-Hour Ozone (2015) | | Baltimore, MD - (Serious) | MARYLAND | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2015-baltimore-city-maryland-baltimore-md-serious/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Baltimore County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2015-baltimore-county-maryland-baltimore-md-serious | Baltimore, MD - (Serious) | 8-Hour Ozone (2015) | baltimore-md-serious | https://www3.epa.gov/airquality/greenbook/ancl.html | Baltimore County | Sulfur Dioxide (2010) | * | Anne Arundel County and Baltimore County, MD | 8-Hour Ozone (2008) | | Baltimore, MD - (Moderate) | 8-Hour Ozone (2015) | | Baltimore, MD - (Serious) | MARYLAND | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2015-baltimore-county-maryland-baltimore-md-serious/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Carroll County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2015-carroll-county-maryland-baltimore-md-serious | Baltimore, MD - (Serious) | 8-Hour Ozone (2015) | baltimore-md-serious | https://www3.epa.gov/airquality/greenbook/ancl.html | Carroll County | 8-Hour Ozone (2008) | | Baltimore, MD - (Moderate) | 8-Hour Ozone (2015) | | Baltimore, MD - (Serious) | MARYLAND | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2015-carroll-county-maryland-baltimore-md-serious/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Harford County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2015-harford-county-maryland-baltimore-md-serious | Baltimore, MD - (Serious) | 8-Hour Ozone (2015) | baltimore-md-serious | https://www3.epa.gov/airquality/greenbook/ancl.html | Harford County | 8-Hour Ozone (2008) | | Baltimore, MD - (Moderate) | 8-Hour Ozone (2015) | | Baltimore, MD - (Serious) | MARYLAND | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2015-harford-county-maryland-baltimore-md-serious/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Howard County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2015-howard-county-maryland-baltimore-md-serious | Baltimore, MD - (Serious) | 8-Hour Ozone (2015) | baltimore-md-serious | https://www3.epa.gov/airquality/greenbook/ancl.html | Howard County | 8-Hour Ozone (2008) | | Baltimore, MD - (Moderate) | 8-Hour Ozone (2015) | | Baltimore, MD - (Serious) | MARYLAND | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2015-howard-county-maryland-baltimore-md-serious/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Berrien County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2015-berrien-county-michigan-berrien-county-mi-serious | Berrien County, MI - (Serious) | 8-Hour Ozone (2015) | berrien-county-mi-serious | https://www3.epa.gov/airquality/greenbook/ancl.html | Berrien County | 8-Hour Ozone (2015) | | Berrien County, MI - (Serious) | MICHIGAN | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2015-berrien-county-michigan-berrien-county-mi-serious/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Butte County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2015-butte-county-california-butte-county-ca-marginal | Butte County, CA - (Marginal) | 8-Hour Ozone (2015) | butte-county-ca-marginal | https://www3.epa.gov/airquality/greenbook/ancl.html | Butte County | 8-Hour Ozone (2008) | | Chico (Butte County), CA - (Marginal) | 8-Hour Ozone (2015) | | Butte County, CA - (Marginal) | CALIFORNIA | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2015-butte-county-california-butte-county-ca-marginal/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Calaveras County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2008-calaveras-county-california-calaveras-county-ca-marginal | Calaveras County, CA - (Marginal) | 8-Hour Ozone (2008) | calaveras-county-ca-marginal | https://www3.epa.gov/airquality/greenbook/ancl.html | Calaveras County | 8-Hour Ozone (2008) | | Calaveras County, CA - (Marginal) | CALIFORNIA | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2008-calaveras-county-california-calaveras-county-ca-marginal/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Calaveras County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2015-calaveras-county-california-calaveras-county-ca-marginal | Calaveras County, CA - (Marginal) | 8-Hour Ozone (2015) | calaveras-county-ca-marginal | https://www3.epa.gov/airquality/greenbook/ancl.html | Calaveras County | 8-Hour Ozone (2008) | | Calaveras County, CA - (Marginal) | 8-Hour Ozone (2015) | | Calaveras County, CA - (Marginal) | CALIFORNIA | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2015-calaveras-county-california-calaveras-county-ca-marginal/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Cambria County | September 30, 2026 | [
"partial_county",
"row_id",
"state"
] | sulfur-dioxide-2010-cambria-county-pennsylvania-cambria-westmoreland-area-pa | Cambria-Westmoreland Area, PA | Sulfur Dioxide (2010) | cambria-westmoreland-area-pa | https://www3.epa.gov/airquality/greenbook/ancl.html | Cambria County | Sulfur Dioxide (2010) | * | Cambria-Westmoreland Area, PA | PENNSYLVANIA | https://referencesource.org/nonattainment-county-designations-by-pollutant/sulfur-dioxide-2010-cambria-county-pennsylvania-cambria-westmoreland-area-pa/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | yes |
Westmoreland County | September 30, 2026 | [
"partial_county",
"row_id",
"state"
] | sulfur-dioxide-2010-westmoreland-county-pennsylvania-cambria-westmoreland-area-pa | Cambria-Westmoreland Area, PA | Sulfur Dioxide (2010) | cambria-westmoreland-area-pa | https://www3.epa.gov/airquality/greenbook/ancl.html | Westmoreland County | Sulfur Dioxide (2010) | * | Cambria-Westmoreland Area, PA | PENNSYLVANIA | https://referencesource.org/nonattainment-county-designations-by-pollutant/sulfur-dioxide-2010-westmoreland-county-pennsylvania-cambria-westmoreland-area-pa/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | yes |
Cecil County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2008-cecil-county-maryland-cecil-county-md-marginal | Cecil County, MD - (Marginal) | 8-Hour Ozone (2008) | cecil-county-md-marginal | https://www3.epa.gov/airquality/greenbook/ancl.html | Cecil County | 8-Hour Ozone (2008) | | Cecil County, MD - (Marginal) | MARYLAND | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2008-cecil-county-maryland-cecil-county-md-marginal/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Cecil County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2015-cecil-county-maryland-cecil-county-md-serious | Cecil County, MD - (Serious) | 8-Hour Ozone (2015) | cecil-county-md-serious | https://www3.epa.gov/airquality/greenbook/ancl.html | Cecil County | 8-Hour Ozone (2008) | | Cecil County, MD - (Marginal) | 8-Hour Ozone (2015) | | Cecil County, MD - (Serious) | MARYLAND | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2015-cecil-county-maryland-cecil-county-md-serious/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Cook County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2015-cook-county-illinois-chicago-il-in-wi-serious | Chicago, IL-IN-WI - (Serious) | 8-Hour Ozone (2015) | chicago-il-in-wi-serious | https://www3.epa.gov/airquality/greenbook/ancl.html | Cook County | 8-Hour Ozone (2015) | | Chicago, IL-IN-WI - (Serious) | ILLINOIS | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2015-cook-county-illinois-chicago-il-in-wi-serious/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
DuPage County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2015-dupage-county-illinois-chicago-il-in-wi-serious | Chicago, IL-IN-WI - (Serious) | 8-Hour Ozone (2015) | chicago-il-in-wi-serious | https://www3.epa.gov/airquality/greenbook/ancl.html | DuPage County | 8-Hour Ozone (2015) | | Chicago, IL-IN-WI - (Serious) | ILLINOIS | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2015-dupage-county-illinois-chicago-il-in-wi-serious/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Grundy County | September 30, 2026 | [
"partial_county",
"row_id",
"state"
] | 8-hour-ozone-2015-grundy-county-illinois-chicago-il-in-wi-serious | Chicago, IL-IN-WI - (Serious) | 8-Hour Ozone (2015) | chicago-il-in-wi-serious | https://www3.epa.gov/airquality/greenbook/ancl.html | Grundy County | 8-Hour Ozone (2015) | * | Chicago, IL-IN-WI - (Serious) | ILLINOIS | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2015-grundy-county-illinois-chicago-il-in-wi-serious/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | yes |
Kane County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2015-kane-county-illinois-chicago-il-in-wi-serious | Chicago, IL-IN-WI - (Serious) | 8-Hour Ozone (2015) | chicago-il-in-wi-serious | https://www3.epa.gov/airquality/greenbook/ancl.html | Kane County | 8-Hour Ozone (2015) | | Chicago, IL-IN-WI - (Serious) | ILLINOIS | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2015-kane-county-illinois-chicago-il-in-wi-serious/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Kendall County | September 30, 2026 | [
"partial_county",
"row_id",
"state"
] | 8-hour-ozone-2015-kendall-county-illinois-chicago-il-in-wi-serious | Chicago, IL-IN-WI - (Serious) | 8-Hour Ozone (2015) | chicago-il-in-wi-serious | https://www3.epa.gov/airquality/greenbook/ancl.html | Kendall County | 8-Hour Ozone (2015) | * | Chicago, IL-IN-WI - (Serious) | ILLINOIS | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2015-kendall-county-illinois-chicago-il-in-wi-serious/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | yes |
Kenosha County | September 30, 2026 | [
"partial_county",
"row_id",
"state"
] | 8-hour-ozone-2015-kenosha-county-wisconsin-chicago-il-in-wi-serious | Chicago, IL-IN-WI - (Serious) | 8-Hour Ozone (2015) | chicago-il-in-wi-serious | https://www3.epa.gov/airquality/greenbook/ancl.html | Kenosha County | 8-Hour Ozone (2015) | * | Chicago, IL-IN-WI - (Serious) | WISCONSIN | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2015-kenosha-county-wisconsin-chicago-il-in-wi-serious/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | yes |
Lake County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2015-lake-county-illinois-chicago-il-in-wi-serious | Chicago, IL-IN-WI - (Serious) | 8-Hour Ozone (2015) | chicago-il-in-wi-serious | https://www3.epa.gov/airquality/greenbook/ancl.html | Lake County | 8-Hour Ozone (2015) | | Chicago, IL-IN-WI - (Serious) | ILLINOIS | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2015-lake-county-illinois-chicago-il-in-wi-serious/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Lake County | September 30, 2026 | [
"partial_county",
"row_id",
"state"
] | 8-hour-ozone-2015-lake-county-indiana-chicago-il-in-wi-serious | Chicago, IL-IN-WI - (Serious) | 8-Hour Ozone (2015) | chicago-il-in-wi-serious | https://www3.epa.gov/airquality/greenbook/ancl.html | Lake County | 8-Hour Ozone (2015) | * | Chicago, IL-IN-WI - (Serious) | INDIANA | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2015-lake-county-indiana-chicago-il-in-wi-serious/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | yes |
McHenry County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2015-mchenry-county-illinois-chicago-il-in-wi-serious | Chicago, IL-IN-WI - (Serious) | 8-Hour Ozone (2015) | chicago-il-in-wi-serious | https://www3.epa.gov/airquality/greenbook/ancl.html | McHenry County | 8-Hour Ozone (2015) | | Chicago, IL-IN-WI - (Serious) | ILLINOIS | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2015-mchenry-county-illinois-chicago-il-in-wi-serious/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Porter County | September 30, 2026 | [
"partial_county",
"row_id",
"state"
] | 8-hour-ozone-2015-porter-county-indiana-chicago-il-in-wi-serious | Chicago, IL-IN-WI - (Serious) | 8-Hour Ozone (2015) | chicago-il-in-wi-serious | https://www3.epa.gov/airquality/greenbook/ancl.html | Porter County | 8-Hour Ozone (2015) | * | Chicago, IL-IN-WI - (Serious) | INDIANA | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2015-porter-county-indiana-chicago-il-in-wi-serious/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | yes |
Will County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2015-will-county-illinois-chicago-il-in-wi-serious | Chicago, IL-IN-WI - (Serious) | 8-Hour Ozone (2015) | chicago-il-in-wi-serious | https://www3.epa.gov/airquality/greenbook/ancl.html | Will County | 8-Hour Ozone (2015) | | Chicago, IL-IN-WI - (Serious) | ILLINOIS | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2015-will-county-illinois-chicago-il-in-wi-serious/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Butte County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2008-butte-county-california-chico-butte-county-ca-marginal | Chico (Butte County), CA - (Marginal) | 8-Hour Ozone (2008) | chico-butte-county-ca-marginal | https://www3.epa.gov/airquality/greenbook/ancl.html | Butte County | 8-Hour Ozone (2008) | | Chico (Butte County), CA - (Marginal) | CALIFORNIA | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2008-butte-county-california-chico-butte-county-ca-marginal/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Cochise County | September 30, 2026 | [
"partial_county",
"row_id",
"state"
] | pm-10-1987-cochise-county-arizona-cochise-county-paul-spur-douglas-planning-area-az-moderate | Cochise County; Paul Spur/Douglas planning area, AZ - (Moderate) | PM-10 (1987) | cochise-county-paul-spur-douglas-planning-area-az-moderate | https://www3.epa.gov/airquality/greenbook/ancl.html | Cochise County | PM-10 (1987) | * | Cochise County; Paul Spur/Douglas planning area, AZ - (Moderate) | ARIZONA | https://referencesource.org/nonattainment-county-designations-by-pollutant/pm-10-1987-cochise-county-arizona-cochise-county-paul-spur-douglas-planning-area-az-moderate/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | yes |
Collin County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2015-collin-county-texas-dallas-fort-worth-tx-serious | Dallas-Fort Worth, TX - (Serious) | 8-Hour Ozone (2015) | dallas-fort-worth-tx-serious | https://www3.epa.gov/airquality/greenbook/ancl.html | Collin County | 8-Hour Ozone (2008) | | Dallas-Fort Worth, TX - (Severe 15) | 8-Hour Ozone (2015) | | Dallas-Fort Worth, TX - (Serious) | TEXAS | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2015-collin-county-texas-dallas-fort-worth-tx-serious/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Dallas County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2015-dallas-county-texas-dallas-fort-worth-tx-serious | Dallas-Fort Worth, TX - (Serious) | 8-Hour Ozone (2015) | dallas-fort-worth-tx-serious | https://www3.epa.gov/airquality/greenbook/ancl.html | Dallas County | 8-Hour Ozone (2008) | | Dallas-Fort Worth, TX - (Severe 15) | 8-Hour Ozone (2015) | | Dallas-Fort Worth, TX - (Serious) | TEXAS | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2015-dallas-county-texas-dallas-fort-worth-tx-serious/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Denton County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2015-denton-county-texas-dallas-fort-worth-tx-serious | Dallas-Fort Worth, TX - (Serious) | 8-Hour Ozone (2015) | dallas-fort-worth-tx-serious | https://www3.epa.gov/airquality/greenbook/ancl.html | Denton County | 8-Hour Ozone (2008) | | Dallas-Fort Worth, TX - (Severe 15) | 8-Hour Ozone (2015) | | Dallas-Fort Worth, TX - (Serious) | TEXAS | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2015-denton-county-texas-dallas-fort-worth-tx-serious/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Ellis County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2015-ellis-county-texas-dallas-fort-worth-tx-serious | Dallas-Fort Worth, TX - (Serious) | 8-Hour Ozone (2015) | dallas-fort-worth-tx-serious | https://www3.epa.gov/airquality/greenbook/ancl.html | Ellis County | 8-Hour Ozone (2008) | | Dallas-Fort Worth, TX - (Severe 15) | 8-Hour Ozone (2015) | | Dallas-Fort Worth, TX - (Serious) | TEXAS | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2015-ellis-county-texas-dallas-fort-worth-tx-serious/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Johnson County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2015-johnson-county-texas-dallas-fort-worth-tx-serious | Dallas-Fort Worth, TX - (Serious) | 8-Hour Ozone (2015) | dallas-fort-worth-tx-serious | https://www3.epa.gov/airquality/greenbook/ancl.html | Johnson County | 8-Hour Ozone (2008) | | Dallas-Fort Worth, TX - (Severe 15) | 8-Hour Ozone (2015) | | Dallas-Fort Worth, TX - (Serious) | TEXAS | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2015-johnson-county-texas-dallas-fort-worth-tx-serious/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Kaufman County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2015-kaufman-county-texas-dallas-fort-worth-tx-serious | Dallas-Fort Worth, TX - (Serious) | 8-Hour Ozone (2015) | dallas-fort-worth-tx-serious | https://www3.epa.gov/airquality/greenbook/ancl.html | Kaufman County | 8-Hour Ozone (2008) | | Dallas-Fort Worth, TX - (Severe 15) | 8-Hour Ozone (2015) | | Dallas-Fort Worth, TX - (Serious) | TEXAS | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2015-kaufman-county-texas-dallas-fort-worth-tx-serious/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Parker County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2015-parker-county-texas-dallas-fort-worth-tx-serious | Dallas-Fort Worth, TX - (Serious) | 8-Hour Ozone (2015) | dallas-fort-worth-tx-serious | https://www3.epa.gov/airquality/greenbook/ancl.html | Parker County | 8-Hour Ozone (2008) | | Dallas-Fort Worth, TX - (Severe 15) | 8-Hour Ozone (2015) | | Dallas-Fort Worth, TX - (Serious) | TEXAS | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2015-parker-county-texas-dallas-fort-worth-tx-serious/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Tarrant County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2015-tarrant-county-texas-dallas-fort-worth-tx-serious | Dallas-Fort Worth, TX - (Serious) | 8-Hour Ozone (2015) | dallas-fort-worth-tx-serious | https://www3.epa.gov/airquality/greenbook/ancl.html | Tarrant County | 8-Hour Ozone (2008) | | Dallas-Fort Worth, TX - (Severe 15) | 8-Hour Ozone (2015) | | Dallas-Fort Worth, TX - (Serious) | TEXAS | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2015-tarrant-county-texas-dallas-fort-worth-tx-serious/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Wise County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2015-wise-county-texas-dallas-fort-worth-tx-serious | Dallas-Fort Worth, TX - (Serious) | 8-Hour Ozone (2015) | dallas-fort-worth-tx-serious | https://www3.epa.gov/airquality/greenbook/ancl.html | Wise County | 8-Hour Ozone (2008) | | Dallas-Fort Worth, TX - (Severe 15) | 8-Hour Ozone (2015) | | Dallas-Fort Worth, TX - (Serious) | TEXAS | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2015-wise-county-texas-dallas-fort-worth-tx-serious/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Collin County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2008-collin-county-texas-dallas-fort-worth-tx-severe-15 | Dallas-Fort Worth, TX - (Severe 15) | 8-Hour Ozone (2008) | dallas-fort-worth-tx-severe-15 | https://www3.epa.gov/airquality/greenbook/ancl.html | Collin County | 8-Hour Ozone (2008) | | Dallas-Fort Worth, TX - (Severe 15) | TEXAS | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2008-collin-county-texas-dallas-fort-worth-tx-severe-15/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Dallas County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2008-dallas-county-texas-dallas-fort-worth-tx-severe-15 | Dallas-Fort Worth, TX - (Severe 15) | 8-Hour Ozone (2008) | dallas-fort-worth-tx-severe-15 | https://www3.epa.gov/airquality/greenbook/ancl.html | Dallas County | 8-Hour Ozone (2008) | | Dallas-Fort Worth, TX - (Severe 15) | TEXAS | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2008-dallas-county-texas-dallas-fort-worth-tx-severe-15/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Denton County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2008-denton-county-texas-dallas-fort-worth-tx-severe-15 | Dallas-Fort Worth, TX - (Severe 15) | 8-Hour Ozone (2008) | dallas-fort-worth-tx-severe-15 | https://www3.epa.gov/airquality/greenbook/ancl.html | Denton County | 8-Hour Ozone (2008) | | Dallas-Fort Worth, TX - (Severe 15) | TEXAS | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2008-denton-county-texas-dallas-fort-worth-tx-severe-15/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Ellis County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2008-ellis-county-texas-dallas-fort-worth-tx-severe-15 | Dallas-Fort Worth, TX - (Severe 15) | 8-Hour Ozone (2008) | dallas-fort-worth-tx-severe-15 | https://www3.epa.gov/airquality/greenbook/ancl.html | Ellis County | 8-Hour Ozone (2008) | | Dallas-Fort Worth, TX - (Severe 15) | TEXAS | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2008-ellis-county-texas-dallas-fort-worth-tx-severe-15/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Johnson County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2008-johnson-county-texas-dallas-fort-worth-tx-severe-15 | Dallas-Fort Worth, TX - (Severe 15) | 8-Hour Ozone (2008) | dallas-fort-worth-tx-severe-15 | https://www3.epa.gov/airquality/greenbook/ancl.html | Johnson County | 8-Hour Ozone (2008) | | Dallas-Fort Worth, TX - (Severe 15) | TEXAS | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2008-johnson-county-texas-dallas-fort-worth-tx-severe-15/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Kaufman County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2008-kaufman-county-texas-dallas-fort-worth-tx-severe-15 | Dallas-Fort Worth, TX - (Severe 15) | 8-Hour Ozone (2008) | dallas-fort-worth-tx-severe-15 | https://www3.epa.gov/airquality/greenbook/ancl.html | Kaufman County | 8-Hour Ozone (2008) | | Dallas-Fort Worth, TX - (Severe 15) | TEXAS | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2008-kaufman-county-texas-dallas-fort-worth-tx-severe-15/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Parker County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2008-parker-county-texas-dallas-fort-worth-tx-severe-15 | Dallas-Fort Worth, TX - (Severe 15) | 8-Hour Ozone (2008) | dallas-fort-worth-tx-severe-15 | https://www3.epa.gov/airquality/greenbook/ancl.html | Parker County | 8-Hour Ozone (2008) | | Dallas-Fort Worth, TX - (Severe 15) | TEXAS | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2008-parker-county-texas-dallas-fort-worth-tx-severe-15/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Rockwall County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2008-rockwall-county-texas-dallas-fort-worth-tx-severe-15 | Dallas-Fort Worth, TX - (Severe 15) | 8-Hour Ozone (2008) | dallas-fort-worth-tx-severe-15 | https://www3.epa.gov/airquality/greenbook/ancl.html | Rockwall County | 8-Hour Ozone (2008) | | Dallas-Fort Worth, TX - (Severe 15) | TEXAS | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2008-rockwall-county-texas-dallas-fort-worth-tx-severe-15/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Tarrant County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2008-tarrant-county-texas-dallas-fort-worth-tx-severe-15 | Dallas-Fort Worth, TX - (Severe 15) | 8-Hour Ozone (2008) | dallas-fort-worth-tx-severe-15 | https://www3.epa.gov/airquality/greenbook/ancl.html | Tarrant County | 8-Hour Ozone (2008) | | Dallas-Fort Worth, TX - (Severe 15) | TEXAS | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2008-tarrant-county-texas-dallas-fort-worth-tx-severe-15/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Wise County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2008-wise-county-texas-dallas-fort-worth-tx-severe-15 | Dallas-Fort Worth, TX - (Severe 15) | 8-Hour Ozone (2008) | dallas-fort-worth-tx-severe-15 | https://www3.epa.gov/airquality/greenbook/ancl.html | Wise County | 8-Hour Ozone (2008) | | Dallas-Fort Worth, TX - (Severe 15) | TEXAS | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2008-wise-county-texas-dallas-fort-worth-tx-severe-15/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Adams County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2008-adams-county-colorado-denver-boulder-greeley-ft-collins-loveland-co-severe-15 | Denver-Boulder-Greeley-Ft. Collins-Loveland, CO - (Severe 15) | 8-Hour Ozone (2008) | denver-boulder-greeley-ft-collins-loveland-co-severe-15 | https://www3.epa.gov/airquality/greenbook/ancl.html | Adams County | 8-Hour Ozone (2008) | | Denver-Boulder-Greeley-Ft. Collins-Loveland, CO - (Severe 15) | COLORADO | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2008-adams-county-colorado-denver-boulder-greeley-ft-collins-loveland-co-severe-15/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Arapahoe County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2008-arapahoe-county-colorado-denver-boulder-greeley-ft-collins-loveland-co-severe-15 | Denver-Boulder-Greeley-Ft. Collins-Loveland, CO - (Severe 15) | 8-Hour Ozone (2008) | denver-boulder-greeley-ft-collins-loveland-co-severe-15 | https://www3.epa.gov/airquality/greenbook/ancl.html | Arapahoe County | 8-Hour Ozone (2008) | | Denver-Boulder-Greeley-Ft. Collins-Loveland, CO - (Severe 15) | COLORADO | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2008-arapahoe-county-colorado-denver-boulder-greeley-ft-collins-loveland-co-severe-15/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Boulder County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2008-boulder-county-colorado-denver-boulder-greeley-ft-collins-loveland-co-severe-15 | Denver-Boulder-Greeley-Ft. Collins-Loveland, CO - (Severe 15) | 8-Hour Ozone (2008) | denver-boulder-greeley-ft-collins-loveland-co-severe-15 | https://www3.epa.gov/airquality/greenbook/ancl.html | Boulder County | 8-Hour Ozone (2008) | | Denver-Boulder-Greeley-Ft. Collins-Loveland, CO - (Severe 15) | COLORADO | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2008-boulder-county-colorado-denver-boulder-greeley-ft-collins-loveland-co-severe-15/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Broomfield County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2008-broomfield-county-colorado-denver-boulder-greeley-ft-collins-loveland-co-severe-15 | Denver-Boulder-Greeley-Ft. Collins-Loveland, CO - (Severe 15) | 8-Hour Ozone (2008) | denver-boulder-greeley-ft-collins-loveland-co-severe-15 | https://www3.epa.gov/airquality/greenbook/ancl.html | Broomfield County | 8-Hour Ozone (2008) | | Denver-Boulder-Greeley-Ft. Collins-Loveland, CO - (Severe 15) | COLORADO | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2008-broomfield-county-colorado-denver-boulder-greeley-ft-collins-loveland-co-severe-15/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Denver County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2008-denver-county-colorado-denver-boulder-greeley-ft-collins-loveland-co-severe-15 | Denver-Boulder-Greeley-Ft. Collins-Loveland, CO - (Severe 15) | 8-Hour Ozone (2008) | denver-boulder-greeley-ft-collins-loveland-co-severe-15 | https://www3.epa.gov/airquality/greenbook/ancl.html | Denver County | 8-Hour Ozone (2008) | | Denver-Boulder-Greeley-Ft. Collins-Loveland, CO - (Severe 15) | COLORADO | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2008-denver-county-colorado-denver-boulder-greeley-ft-collins-loveland-co-severe-15/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Douglas County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2008-douglas-county-colorado-denver-boulder-greeley-ft-collins-loveland-co-severe-15 | Denver-Boulder-Greeley-Ft. Collins-Loveland, CO - (Severe 15) | 8-Hour Ozone (2008) | denver-boulder-greeley-ft-collins-loveland-co-severe-15 | https://www3.epa.gov/airquality/greenbook/ancl.html | Douglas County | 8-Hour Ozone (2008) | | Denver-Boulder-Greeley-Ft. Collins-Loveland, CO - (Severe 15) | COLORADO | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2008-douglas-county-colorado-denver-boulder-greeley-ft-collins-loveland-co-severe-15/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Jefferson County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2008-jefferson-county-colorado-denver-boulder-greeley-ft-collins-loveland-co-severe-15 | Denver-Boulder-Greeley-Ft. Collins-Loveland, CO - (Severe 15) | 8-Hour Ozone (2008) | denver-boulder-greeley-ft-collins-loveland-co-severe-15 | https://www3.epa.gov/airquality/greenbook/ancl.html | Jefferson County | 8-Hour Ozone (2008) | | Denver-Boulder-Greeley-Ft. Collins-Loveland, CO - (Severe 15) | COLORADO | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2008-jefferson-county-colorado-denver-boulder-greeley-ft-collins-loveland-co-severe-15/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Larimer County | September 30, 2026 | [
"partial_county",
"row_id",
"state"
] | 8-hour-ozone-2008-larimer-county-colorado-denver-boulder-greeley-ft-collins-loveland-co-severe-15 | Denver-Boulder-Greeley-Ft. Collins-Loveland, CO - (Severe 15) | 8-Hour Ozone (2008) | denver-boulder-greeley-ft-collins-loveland-co-severe-15 | https://www3.epa.gov/airquality/greenbook/ancl.html | Larimer County | 8-Hour Ozone (2008) | * | Denver-Boulder-Greeley-Ft. Collins-Loveland, CO - (Severe 15) | COLORADO | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2008-larimer-county-colorado-denver-boulder-greeley-ft-collins-loveland-co-severe-15/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | yes |
Weld County | September 30, 2026 | [
"partial_county",
"row_id",
"state"
] | 8-hour-ozone-2008-weld-county-colorado-denver-boulder-greeley-ft-collins-loveland-co-severe-15 | Denver-Boulder-Greeley-Ft. Collins-Loveland, CO - (Severe 15) | 8-Hour Ozone (2008) | denver-boulder-greeley-ft-collins-loveland-co-severe-15 | https://www3.epa.gov/airquality/greenbook/ancl.html | Weld County | 8-Hour Ozone (2008) | * | Denver-Boulder-Greeley-Ft. Collins-Loveland, CO - (Severe 15) | COLORADO | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2008-weld-county-colorado-denver-boulder-greeley-ft-collins-loveland-co-severe-15/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | yes |
Adams County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2015-adams-county-colorado-denver-metro-north-front-range-co-serious | Denver Metro/North Front Range, CO - (Serious) | 8-Hour Ozone (2015) | denver-metro-north-front-range-co-serious | https://www3.epa.gov/airquality/greenbook/ancl.html | Adams County | 8-Hour Ozone (2008) | | Denver-Boulder-Greeley-Ft. Collins-Loveland, CO - (Severe 15) | 8-Hour Ozone (2015) | | Denver Metro/North Front Range, CO - (Serious) | COLORADO | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2015-adams-county-colorado-denver-metro-north-front-range-co-serious/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Arapahoe County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2015-arapahoe-county-colorado-denver-metro-north-front-range-co-serious | Denver Metro/North Front Range, CO - (Serious) | 8-Hour Ozone (2015) | denver-metro-north-front-range-co-serious | https://www3.epa.gov/airquality/greenbook/ancl.html | Arapahoe County | 8-Hour Ozone (2008) | | Denver-Boulder-Greeley-Ft. Collins-Loveland, CO - (Severe 15) | 8-Hour Ozone (2015) | | Denver Metro/North Front Range, CO - (Serious) | COLORADO | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2015-arapahoe-county-colorado-denver-metro-north-front-range-co-serious/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Boulder County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2015-boulder-county-colorado-denver-metro-north-front-range-co-serious | Denver Metro/North Front Range, CO - (Serious) | 8-Hour Ozone (2015) | denver-metro-north-front-range-co-serious | https://www3.epa.gov/airquality/greenbook/ancl.html | Boulder County | 8-Hour Ozone (2008) | | Denver-Boulder-Greeley-Ft. Collins-Loveland, CO - (Severe 15) | 8-Hour Ozone (2015) | | Denver Metro/North Front Range, CO - (Serious) | COLORADO | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2015-boulder-county-colorado-denver-metro-north-front-range-co-serious/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Broomfield County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2015-broomfield-county-colorado-denver-metro-north-front-range-co-serious | Denver Metro/North Front Range, CO - (Serious) | 8-Hour Ozone (2015) | denver-metro-north-front-range-co-serious | https://www3.epa.gov/airquality/greenbook/ancl.html | Broomfield County | 8-Hour Ozone (2008) | | Denver-Boulder-Greeley-Ft. Collins-Loveland, CO - (Severe 15) | 8-Hour Ozone (2015) | | Denver Metro/North Front Range, CO - (Serious) | COLORADO | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2015-broomfield-county-colorado-denver-metro-north-front-range-co-serious/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Denver County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2015-denver-county-colorado-denver-metro-north-front-range-co-serious | Denver Metro/North Front Range, CO - (Serious) | 8-Hour Ozone (2015) | denver-metro-north-front-range-co-serious | https://www3.epa.gov/airquality/greenbook/ancl.html | Denver County | 8-Hour Ozone (2008) | | Denver-Boulder-Greeley-Ft. Collins-Loveland, CO - (Severe 15) | 8-Hour Ozone (2015) | | Denver Metro/North Front Range, CO - (Serious) | COLORADO | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2015-denver-county-colorado-denver-metro-north-front-range-co-serious/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Douglas County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2015-douglas-county-colorado-denver-metro-north-front-range-co-serious | Denver Metro/North Front Range, CO - (Serious) | 8-Hour Ozone (2015) | denver-metro-north-front-range-co-serious | https://www3.epa.gov/airquality/greenbook/ancl.html | Douglas County | 8-Hour Ozone (2008) | | Denver-Boulder-Greeley-Ft. Collins-Loveland, CO - (Severe 15) | 8-Hour Ozone (2015) | | Denver Metro/North Front Range, CO - (Serious) | COLORADO | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2015-douglas-county-colorado-denver-metro-north-front-range-co-serious/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Jefferson County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2015-jefferson-county-colorado-denver-metro-north-front-range-co-serious | Denver Metro/North Front Range, CO - (Serious) | 8-Hour Ozone (2015) | denver-metro-north-front-range-co-serious | https://www3.epa.gov/airquality/greenbook/ancl.html | Jefferson County | 8-Hour Ozone (2008) | | Denver-Boulder-Greeley-Ft. Collins-Loveland, CO - (Severe 15) | 8-Hour Ozone (2015) | | Denver Metro/North Front Range, CO - (Serious) | COLORADO | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2015-jefferson-county-colorado-denver-metro-north-front-range-co-serious/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Larimer County | September 30, 2026 | [
"partial_county",
"row_id",
"state"
] | 8-hour-ozone-2015-larimer-county-colorado-denver-metro-north-front-range-co-serious | Denver Metro/North Front Range, CO - (Serious) | 8-Hour Ozone (2015) | denver-metro-north-front-range-co-serious | https://www3.epa.gov/airquality/greenbook/ancl.html | Larimer County | 8-Hour Ozone (2008) | * | Denver-Boulder-Greeley-Ft. Collins-Loveland, CO - (Severe 15) | 8-Hour Ozone (2015) | * | Denver Metro/North Front Range, CO - (Serious) | COLORADO | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2015-larimer-county-colorado-denver-metro-north-front-range-co-serious/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | yes |
Weld County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2015-weld-county-colorado-denver-metro-north-front-range-co-serious | Denver Metro/North Front Range, CO - (Serious) | 8-Hour Ozone (2015) | denver-metro-north-front-range-co-serious | https://www3.epa.gov/airquality/greenbook/ancl.html | Weld County | 8-Hour Ozone (2008) | * | Denver-Boulder-Greeley-Ft. Collins-Loveland, CO - (Severe 15) | 8-Hour Ozone (2015) | | Denver Metro/North Front Range, CO - (Serious) | COLORADO | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2015-weld-county-colorado-denver-metro-north-front-range-co-serious/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Livingston County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2015-livingston-county-michigan-detroit-mi-moderate | Detroit, MI - (Moderate) | 8-Hour Ozone (2015) | detroit-mi-moderate | https://www3.epa.gov/airquality/greenbook/ancl.html | Livingston County | 8-Hour Ozone (2015) | | Detroit, MI - (Moderate) | MICHIGAN | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2015-livingston-county-michigan-detroit-mi-moderate/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Macomb County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2015-macomb-county-michigan-detroit-mi-moderate | Detroit, MI - (Moderate) | 8-Hour Ozone (2015) | detroit-mi-moderate | https://www3.epa.gov/airquality/greenbook/ancl.html | Macomb County | 8-Hour Ozone (2015) | | Detroit, MI - (Moderate) | MICHIGAN | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2015-macomb-county-michigan-detroit-mi-moderate/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Monroe County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2015-monroe-county-michigan-detroit-mi-moderate | Detroit, MI - (Moderate) | 8-Hour Ozone (2015) | detroit-mi-moderate | https://www3.epa.gov/airquality/greenbook/ancl.html | Monroe County | 8-Hour Ozone (2015) | | Detroit, MI - (Moderate) | MICHIGAN | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2015-monroe-county-michigan-detroit-mi-moderate/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Oakland County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2015-oakland-county-michigan-detroit-mi-moderate | Detroit, MI - (Moderate) | 8-Hour Ozone (2015) | detroit-mi-moderate | https://www3.epa.gov/airquality/greenbook/ancl.html | Oakland County | 8-Hour Ozone (2015) | | Detroit, MI - (Moderate) | MICHIGAN | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2015-oakland-county-michigan-detroit-mi-moderate/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
St. Clair County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2015-st-clair-county-michigan-detroit-mi-moderate | Detroit, MI - (Moderate) | 8-Hour Ozone (2015) | detroit-mi-moderate | https://www3.epa.gov/airquality/greenbook/ancl.html | St. Clair County | 8-Hour Ozone (2015) | | Detroit, MI - (Moderate) | MICHIGAN | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2015-st-clair-county-michigan-detroit-mi-moderate/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Washtenaw County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2015-washtenaw-county-michigan-detroit-mi-moderate | Detroit, MI - (Moderate) | 8-Hour Ozone (2015) | detroit-mi-moderate | https://www3.epa.gov/airquality/greenbook/ancl.html | Washtenaw County | 8-Hour Ozone (2015) | | Detroit, MI - (Moderate) | MICHIGAN | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2015-washtenaw-county-michigan-detroit-mi-moderate/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Wayne County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2015-wayne-county-michigan-detroit-mi-moderate | Detroit, MI - (Moderate) | 8-Hour Ozone (2015) | detroit-mi-moderate | https://www3.epa.gov/airquality/greenbook/ancl.html | Wayne County | 8-Hour Ozone (2015) | | Detroit, MI - (Moderate) | MICHIGAN | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2015-wayne-county-michigan-detroit-mi-moderate/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Dona Ana County | September 30, 2026 | [
"partial_county",
"row_id",
"state"
] | pm-10-1987-dona-ana-county-new-mexico-dona-ana-county-anthony-nm-moderate | Dona Ana County; Anthony, NM - (Moderate) | PM-10 (1987) | dona-ana-county-anthony-nm-moderate | https://www3.epa.gov/airquality/greenbook/ancl.html | Dona Ana County | PM-10 (1987) | * | Dona Ana County; Anthony, NM - (Moderate) | NEW MEXICO | https://referencesource.org/nonattainment-county-designations-by-pollutant/pm-10-1987-dona-ana-county-new-mexico-dona-ana-county-anthony-nm-moderate/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | yes |
Dukes County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2008-dukes-county-massachusetts-dukes-county-ma-marginal | Dukes County, MA - (Marginal) | 8-Hour Ozone (2008) | dukes-county-ma-marginal | https://www3.epa.gov/airquality/greenbook/ancl.html | Dukes County | 8-Hour Ozone (2008) | | Dukes County, MA - (Marginal) | MASSACHUSETTS | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2008-dukes-county-massachusetts-dukes-county-ma-marginal/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Dakota County | September 30, 2026 | [
"partial_county",
"row_id",
"state"
] | lead-2008-dakota-county-minnesota-eagan-mn | Eagan, MN | Lead (2008) | eagan-mn | https://www3.epa.gov/airquality/greenbook/ancl.html | Dakota County | Lead (2008) | * | Eagan, MN | MINNESOTA | https://referencesource.org/nonattainment-county-designations-by-pollutant/lead-2008-dakota-county-minnesota-eagan-mn/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | yes |
Kern County | September 30, 2026 | [
"partial_county",
"row_id",
"state"
] | pm-10-1987-kern-county-california-east-kern-county-ca-serious | East Kern County, CA - (Serious) | PM-10 (1987) | east-kern-county-ca-serious | https://www3.epa.gov/airquality/greenbook/ancl.html | Kern County | PM-10 (1987) | * | East Kern County, CA - (Serious) | CALIFORNIA | https://referencesource.org/nonattainment-county-designations-by-pollutant/pm-10-1987-kern-county-california-east-kern-county-ca-serious/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | yes |
El Paso County | September 30, 2026 | [
"partial_county",
"row_id",
"state"
] | pm-10-1987-el-paso-county-texas-el-paso-county-tx-moderate | El Paso County, TX - (Moderate) | PM-10 (1987) | el-paso-county-tx-moderate | https://www3.epa.gov/airquality/greenbook/ancl.html | El Paso County | PM-10 (1987) | * | El Paso County, TX - (Moderate) | TEXAS | https://referencesource.org/nonattainment-county-designations-by-pollutant/pm-10-1987-el-paso-county-texas-el-paso-county-tx-moderate/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | yes |
Dona Ana County | September 30, 2026 | [
"partial_county",
"row_id",
"state"
] | 8-hour-ozone-2015-dona-ana-county-new-mexico-el-paso-las-cruces-tx-nm-marginal | El Paso-Las Cruces, TX-NM - (Marginal) | 8-Hour Ozone (2015) | el-paso-las-cruces-tx-nm-marginal | https://www3.epa.gov/airquality/greenbook/ancl.html | Dona Ana County | PM-10 (1987) | * | Dona Ana County; Anthony, NM - (Moderate) | 8-Hour Ozone (2015) | * | El Paso-Las Cruces, TX-NM - (Marginal) | NEW MEXICO | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2015-dona-ana-county-new-mexico-el-paso-las-cruces-tx-nm-marginal/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | yes |
El Paso County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2015-el-paso-county-texas-el-paso-las-cruces-tx-nm-marginal | El Paso-Las Cruces, TX-NM - (Marginal) | 8-Hour Ozone (2015) | el-paso-las-cruces-tx-nm-marginal | https://www3.epa.gov/airquality/greenbook/ancl.html | El Paso County | PM-10 (1987) | * | El Paso County, TX - (Moderate) | 8-Hour Ozone (2015) | | El Paso-Las Cruces, TX-NM - (Marginal) | TEXAS | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2015-el-paso-county-texas-el-paso-las-cruces-tx-nm-marginal/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Evangeline Parish | September 30, 2026 | [
"partial_county",
"row_id",
"state"
] | sulfur-dioxide-2010-evangeline-parish-louisiana-evangeline-parish-partial-la | Evangeline Parish (Partial), LA | Sulfur Dioxide (2010) | evangeline-parish-partial-la | https://www3.epa.gov/airquality/greenbook/ancl.html | Evangeline Parish | Sulfur Dioxide (2010) | * | Evangeline Parish (Partial), LA | LOUISIANA | https://referencesource.org/nonattainment-county-designations-by-pollutant/sulfur-dioxide-2010-evangeline-parish-louisiana-evangeline-parish-partial-la/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | yes |
Fairbanks North Star Borough | September 30, 2026 | [
"partial_county",
"row_id",
"state"
] | pm-2-5-2006-fairbanks-north-star-borough-alaska-fairbanks-ak-serious | Fairbanks, AK - (Serious) | PM-2.5 (2006) | fairbanks-ak-serious | https://www3.epa.gov/airquality/greenbook/ancl.html | Fairbanks North Star Borough | PM-2.5 (2006) | * | Fairbanks, AK - (Serious) | ALASKA | https://referencesource.org/nonattainment-county-designations-by-pollutant/pm-2-5-2006-fairbanks-north-star-borough-alaska-fairbanks-ak-serious/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | yes |
Anderson County | September 30, 2026 | [
"partial_county",
"row_id",
"state"
] | sulfur-dioxide-2010-anderson-county-texas-freestone-and-anderson-counties-tx | Freestone and Anderson Counties, TX | Sulfur Dioxide (2010) | freestone-and-anderson-counties-tx | https://www3.epa.gov/airquality/greenbook/ancl.html | Anderson County | Sulfur Dioxide (2010) | * | Freestone and Anderson Counties, TX | TEXAS | https://referencesource.org/nonattainment-county-designations-by-pollutant/sulfur-dioxide-2010-anderson-county-texas-freestone-and-anderson-counties-tx/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | yes |
Freestone County | September 30, 2026 | [
"partial_county",
"row_id",
"state"
] | sulfur-dioxide-2010-freestone-county-texas-freestone-and-anderson-counties-tx | Freestone and Anderson Counties, TX | Sulfur Dioxide (2010) | freestone-and-anderson-counties-tx | https://www3.epa.gov/airquality/greenbook/ancl.html | Freestone County | Sulfur Dioxide (2010) | * | Freestone and Anderson Counties, TX | TEXAS | https://referencesource.org/nonattainment-county-designations-by-pollutant/sulfur-dioxide-2010-freestone-county-texas-freestone-and-anderson-counties-tx/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | yes |
Giles County | September 30, 2026 | [
"partial_county",
"row_id",
"state"
] | sulfur-dioxide-2010-giles-county-virginia-giles-county-va | Giles County, VA | Sulfur Dioxide (2010) | giles-county-va | https://www3.epa.gov/airquality/greenbook/ancl.html | Giles County | Sulfur Dioxide (2010) | * | Giles County, VA | VIRGINIA | https://referencesource.org/nonattainment-county-designations-by-pollutant/sulfur-dioxide-2010-giles-county-virginia-giles-county-va/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | yes |
Hartford County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2008-hartford-county-connecticut-greater-connecticut-ct-serious | Greater Connecticut, CT - (Serious) | 8-Hour Ozone (2008) | greater-connecticut-ct-serious | https://www3.epa.gov/airquality/greenbook/ancl.html | Hartford County | 8-Hour Ozone (2008) | | Greater Connecticut, CT - (Serious) | CONNECTICUT | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2008-hartford-county-connecticut-greater-connecticut-ct-serious/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
Litchfield County | September 30, 2026 | [
"row_id",
"state"
] | 8-hour-ozone-2008-litchfield-county-connecticut-greater-connecticut-ct-serious | Greater Connecticut, CT - (Serious) | 8-Hour Ozone (2008) | greater-connecticut-ct-serious | https://www3.epa.gov/airquality/greenbook/ancl.html | Litchfield County | 8-Hour Ozone (2008) | | Greater Connecticut, CT - (Serious) | CONNECTICUT | https://referencesource.org/nonattainment-county-designations-by-pollutant/8-hour-ozone-2008-litchfield-county-connecticut-greater-connecticut-ct-serious/ | [
"county",
"nonattainment_area_name",
"pollutant_naaqs"
] | null |
End of preview. Expand in Data Studio
Current EPA nonattainment county designations by pollutant
Canonical, always-current version: https://referencesource.org/nonattainment-county-designations-by-pollutant/ Machine-readable: https://referencesource.org/nonattainment-county-designations-by-pollutant/data.json — this mirror is a point-in-time copy.
- Last verified: 2026-10-05
- Stale after: 2027-04-03 (past this date, prefer the canonical copy — it re-verifies on a cadence this snapshot does not)
- Records: 463
Whether a US county is in 'nonattainment' for a given Clean Air Act pollutant (and if so, at what severity classification) drives real obligations for anyone building, permitting, or selling into that county: stricter new-source review, vehicle inspection and reformulated-fuel requirements, and federal highway-funding conditions all key off this status. EPA's Green Book is the single authoritative list, but it is a very long plain-text table with no per-county lookup and no API — a resident, contractor, or small manufacturer has to scan hundreds of rows by hand to find their county. Each record is one county x one pollutant NAAQS combination: whether it is designated nonattainment, the classification if the pollutant test has one (Marginal through Extreme for ozone; Moderate/Serious for PM), and the named nonattainment area it belongs to. Answers 'is [county] in nonattainment for ozone', 'what classification is [county] for PM-2.5', 'does building in [county] trigger nonattainment-area permitting'.
Provenance — what every record carries
Every record carries source (the URL the value was read from) and
source_quote (a verbatim quote from that page stating it). A value you
cannot check against its page is indistinguishable from an invented one;
these can all be checked. Each record is also individually addressable on
the canonical site at its url.
Licence position
US federal government work, no copyright (17 USC 105)
Facts are not copyrightable; what this dataset takes from each source is a fact plus a short attributed quote linking back to the page that states it.
Sources
Fields
See any record in data/records.jsonl — field names are self-describing,
and the canonical page for each record renders them with labels:
https://referencesource.org/nonattainment-county-designations-by-pollutant/
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