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 |
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