also_reported listlengths 1 8 ⌀ | cas_number stringlengths 5 46 ⌀ | disagreements listlengths 0 2 ⌀ | id stringlengths 3 80 | pel_mgm3 stringlengths 1 11 ⌀ | pel_ppm stringclasses 46
values | source stringlengths 39 79 | source_quote stringlengths 19 139 | substance stringlengths 3 110 | url stringlengths 58 135 | verified_fields listlengths 2 8 | rel_statement stringclasses 20
values | rel_mgm3 stringclasses 81
values | rel_ppm stringclasses 37
values | ceiling_notation stringclasses 2
values | stel_mgm3 stringclasses 31
values | stel_ppm stringclasses 18
values | ceiling stringclasses 4
values |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
[
{
"as_of": "2026-08-05T00:00:00",
"field": "stel_ppm",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "7782505 | | Chlorine | 0.5 | 1.5 | | 1 | 3",
"value": "1"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "stel_mgm3",
"source": "https://www.dir.ca.gov/titl... | 7782-50-5 | [
{
"field": "pel_ppm",
"versions": [
{
"as_of": "2026-08-05T00:00:00",
"source": "https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1",
"source_quote": "Chlorine | 7782-50-5 | (C)1 | (C)3 | - |",
"value": "(C)1"
},
{
"as_of... | chlorine | (C)3 | (C)1 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Chlorine | 7782-50-5 | (C)1 | (C)3 | - | | Chlorine | https://referencesource.org/workplace-exposure-limits/chlorine/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-08-05T00:00:00",
"field": "stel_ppm",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "10049044 | | Chlorine dioxide | 0.1 | 0.3 | | 0.3 | 0.9",
"value": "0.3"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "stel_mgm3",
"source": "https://www.... | 10049-04-4 | [] | chlorine-dioxide | 0.3 | 0.1 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Chlorine dioxide | 10049-04-4 | 0.1 | 0.3 | - | | Chlorine dioxide | https://referencesource.org/workplace-exposure-limits/chlorine-dioxide/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-28T00:00:00",
"field": "ceiling_notation",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "7790912 | | Chlorine trifluoride | 0.1 | 0.4 | C",
"value": "the values given in the PEL columns are ceiling values"
},
{
"as_of": "2026-09-08T00:00:00",
... | 7790-91-2 | [
{
"field": "pel_ppm",
"versions": [
{
"as_of": "2026-08-05T00:00:00",
"source": "https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1",
"source_quote": "Chlorine trifluoride | 7790-91-2 | (C)0.1 | (C)0.4 | - |",
"value": "(C)0.1"
},
... | chlorine-trifluoride | (C)0.4 | (C)0.1 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Chlorine trifluoride | 7790-91-2 | (C)0.1 | (C)0.4 | - | | Chlorine trifluoride | https://referencesource.org/workplace-exposure-limits/chlorine-trifluoride/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-28T00:00:00",
"field": "ceiling_notation",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "107200 | | Chloroacetaldehyde | 1 | 3 | C",
"value": "the values given in the PEL columns are ceiling values"
},
{
"as_of": "2026-09-08T00:00:00",
"fie... | 107-20-0 | [
{
"field": "pel_ppm",
"versions": [
{
"as_of": "2026-08-05T00:00:00",
"source": "https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1",
"source_quote": "Chloroacetaldehyde | 107-20-0 | (C)1 | (C)3 | - |",
"value": "(C)1"
},
{
... | chloroacetaldehyde | (C)3 | (C)1 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Chloroacetaldehyde | 107-20-0 | (C)1 | (C)3 | - | | Chloroacetaldehyde | https://referencesource.org/workplace-exposure-limits/chloroacetaldehyde/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
null | 78955 | null | chloroacetone | 3.8 | 1 | https://www.dir.ca.gov/title8/5155.html | 78955 | S | Chloroacetone | 1 | 3.8 | C | Chloroacetone | https://referencesource.org/workplace-exposure-limits/chloroacetone/ | [
"cas_number",
"ceiling_notation",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | the values given in the PEL columns are ceiling values | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0120.html",
"source_quote": "NIOSH REL TWA 0.05 ppm (0.2 mg/m³)",
"value": "TWA 0.05"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/... | 79049 | [] | chloroacetyl-chloride | 0.2 | 0.05 | https://www.dir.ca.gov/title8/5155.html | 79049 | S | Chloroacetyl chloride | 0.05 | 0.2 | | 0.15 | 0.69 | Chloroacetyl chloride | https://referencesource.org/workplace-exposure-limits/chloroacetyl-chloride/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"stel_mgm3",
"stel_ppm",
"substance"
] | null | null | null | null | 0.69 | 0.15 | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_statement",
"source": "https://www.cdc.gov/niosh/npg/npgd0121.html",
"source_quote": "NIOSH REL See Appendix D",
"value": "See Appendix D"
}
] | 108-90-7 | [
{
"field": "pel_ppm",
"versions": [
{
"as_of": "2026-08-05T00:00:00",
"source": "https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1",
"source_quote": "Chlorobenzene | 108-90-7 | 75 | 350 | - |",
"value": "75"
},
{
"as_of"... | chlorobenzene | 350 | 75 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Chlorobenzene | 108-90-7 | 75 | 350 | - | | Chlorobenzene | https://referencesource.org/workplace-exposure-limits/chlorobenzene/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0123.html",
"source_quote": "NIOSH REL TWA 200 ppm (1050 mg/m3)",
"value": "TWA 200"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/n... | 74-97-5 | [] | chlorobromomethane | 1050 | 200 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Chlorobromomethane | 74-97-5 | 200 | 1050 | - | | Chlorobromomethane | https://referencesource.org/workplace-exposure-limits/chlorobromomethane/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-08-05T00:00:00",
"field": "pel_ppm",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "75456 | | Chlorodifluoromethane; Fluorocarbon 22 | 1,000 | 3,500",
"value": "1,000"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "pel_mgm3",
"source": "htt... | 75-45-6 | [] | chlorodifluoromethane | null | null | https://www.cdc.gov/niosh/npg/npgd0124.html | NIOSH REL TWA 1000 ppm (3500 mg/m3) ST 1250 ppm (4375 mg/m3) | Chlorodifluoromethane | https://referencesource.org/workplace-exposure-limits/chlorodifluoromethane/ | [
"cas_number",
"rel_mgm3",
"rel_ppm",
"substance"
] | null | 3500 | TWA 1000 | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/npgd0125.html",
"source_quote": "NIOSH REL Ca TWA 0.001 mg/m3",
"value": "TWA 0.001"
}
] | 53469219 | [] | chlorodiphenyl-42-chlorine | 1 | null | https://www.dir.ca.gov/title8/5155.html | 53469219 | S | Chlorodiphenyl (42% chlorine) | -- | 1 | Chlorodiphenyl (42% chlorine) | https://referencesource.org/workplace-exposure-limits/chlorodiphenyl-42-chlorine/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/npgd0126.html",
"source_quote": "NIOSH REL Ca TWA 0.001 mg/m3",
"value": "TWA 0.001"
}
] | 11097691 | [] | chlorodiphenyl-54-chlorine | 0.5 | null | https://www.dir.ca.gov/title8/5155.html | 11097691 | S | Chlorodiphenyl (54% chlorine) | -- | 0.5 | Chlorodiphenyl (54% chlorine) | https://referencesource.org/workplace-exposure-limits/chlorodiphenyl-54-chlorine/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-08-05T00:00:00",
"field": "pel_ppm",
"source": "https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1",
"source_quote": "Chloroform (Trichloromethane) | 67-66-3 | (C)50 | (C)240 | - |",
"value": "(C)50"
},
{
"as_of": "2026-08-05T00:00:00",
"... | 67-66-3 | [] | chloroform | null | null | https://www.cdc.gov/niosh/npg/npgd0127.html | NIOSH REL Ca ST 2 ppm (9.78 mg/m3) [60-minute] | Chloroform | https://referencesource.org/workplace-exposure-limits/chloroform/ | [
"cas_number",
"rel_mgm3",
"rel_ppm",
"substance"
] | null | 9.78 | ST 2 | null | null | null | null |
null | 107-30-2 | [] | chloromethyl-methyl-ether | null | null | https://www.cdc.gov/niosh/npg/npgd0129.html | NIOSH REL Ca See Appendix A | Chloromethyl methyl ether | https://referencesource.org/workplace-exposure-limits/chloromethyl-methyl-ether/ | [
"cas_number",
"rel_statement",
"substance"
] | Ca See Appendix A | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0131.html",
"source_quote": "NIOSH REL TWA 1000 ppm (6320 mg/m3)",
"value": "TWA 1000"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh... | 76153 | [] | chloropentafluoroethane | 6,320 | 1,000 | https://www.dir.ca.gov/title8/5155.html | 76153 | | Chloropentafluoroethane | 1,000 | 6,320 | Chloropentafluoroethane | https://referencesource.org/workplace-exposure-limits/chloropentafluoroethane/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0132.html",
"source_quote": "NIOSH REL TWA 0.1 ppm (0.7 mg/m3)",
"value": "TWA 0.1"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/np... | 76-06-2 | [] | chloropicrin | 0.7 | 0.1 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Chloropicrin | 76-06-2 | 0.1 | 0.7 | - | | Chloropicrin | https://referencesource.org/workplace-exposure-limits/chloropicrin/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/npgd0137.html",
"source_quote": "NIOSH REL TWA 0.2 mg/m3 ST 0.6 mg/m3 [skin]",
"value": "TWA 0.2"
}
] | 2921882 | [] | chlorpyrifos | 0.2 | null | https://www.dir.ca.gov/title8/5155.html | 2921882 | S | Chlorpyrifos | -- | 0.2 | Chlorpyrifos | https://referencesource.org/workplace-exposure-limits/chlorpyrifos/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
null | 1333-82-0 (CrO3) | null | chromic-acid-and-chromates | null | null | https://www.cdc.gov/niosh/npg/npgd0138.html | NIOSH REL (as Cr): Ca TWA 0.0002 mg/m3 (8-hours) | Chromic acid and chromates | https://referencesource.org/workplace-exposure-limits/chromic-acid-and-chromates/ | [
"cas_number",
"rel_mgm3",
"substance"
] | null | TWA 0.0002 | null | null | null | null | null |
null | null | null | chromite-ore-processing-chromate-as-cr | 0.005 | null | https://www.dir.ca.gov/title8/5155.html | Chromite ore processing (chromate), as Cr | -- | 0.005 | Chromite ore processing (chromate), as Cr | https://referencesource.org/workplace-exposure-limits/chromite-ore-processing-chromate-as-cr/ | [
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
null | null | null | chromium-ii-compounds-as-cr | 0.5 | null | https://www.dir.ca.gov/title8/5155.html | Chromium (II) compounds, as Cr | -- | 0.5 | Chromium (II) compounds, as Cr | https://referencesource.org/workplace-exposure-limits/chromium-ii-compounds-as-cr/ | [
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
null | null | null | chromium-iii-compounds-as-cr | 0.5 | null | https://www.dir.ca.gov/title8/5155.html | Chromium (III) compounds, as Cr | -- | 0.5 | Chromium (III) compounds, as Cr | https://referencesource.org/workplace-exposure-limits/chromium-iii-compounds-as-cr/ | [
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/npgd0141.html",
"source_quote": "NIOSH REL TWA 0.5 mg/m3",
"value": "TWA 0.5"
}
] | 7440473 | [
{
"field": "pel_mgm3",
"versions": [
{
"as_of": "2026-08-05T00:00:00",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "7440473 | | Chromium metal | -- | 0.5",
"value": "0.5"
},
{
"as_of": "2026-08-05T00:00:00",
"source":... | chromium-metal | 0.5 | null | https://www.dir.ca.gov/title8/5155.html | 7440473 | | Chromium metal | -- | 0.5 | Chromium metal | https://referencesource.org/workplace-exposure-limits/chromium-metal/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
null | null | null | chromium-vi-compounds-as-cr | 0.005 | null | https://www.dir.ca.gov/title8/5155.html | Chromium (VI) compounds, as Cr | -- | 0.005 | 0.1 mg/M3 | Chromium (VI) compounds, as Cr | https://referencesource.org/workplace-exposure-limits/chromium-vi-compounds-as-cr/ | [
"ceiling",
"ceiling_notation",
"pel_mgm3",
"substance"
] | null | null | null | a ceiling value in addition to the TWA values | null | null | 0.1 mg/M3 |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_statement",
"source": "https://www.cdc.gov/niosh/npg/npgd0142.html",
"source_quote": "NIOSH REL Ca TWA 0.001 mg Cr(VI)/m3 See Appendix A See Appendix C",
"value": "Ca TWA 0.001 mg Cr(VI)/m3 See Appendix A See Appendix C"
}
] | 14977618 | [] | chromyl-chloride | 0.15 | 0.025 | https://www.dir.ca.gov/title8/5155.html | 14977618 | | Chromyl chloride | 0.025 | 0.15 | Chromyl chloride | https://referencesource.org/workplace-exposure-limits/chromyl-chloride/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_statement",
"source": "https://www.cdc.gov/niosh/npg/npgd0143.html",
"source_quote": "NIOSH REL TWA 10 mg/m3 (total) ST 20 mg/m3 (total) TWA 5 mg/m3 (resp)",
"value": "TWA 10 mg/m3 (total) ST 20 mg/m3 (total) TWA 5 mg/m3 (resp)"
}
] | 2971-90-6 | [] | clopidol | null | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Clopidol | 2971-90-6 | - | - | - | | Clopidol | https://referencesource.org/workplace-exposure-limits/clopidol/ | [
"cas_number",
"substance"
] | null | null | null | null | null | null | null |
null | 65996-93-2 | null | coal-tar-pitch-volatiles | null | null | https://www.cdc.gov/niosh/npg/npgd0145.html | NIOSH REL Ca TWA 0.1 mg/m3 (cyclohexane-extractable fraction) | Coal tar pitch volatiles | https://referencesource.org/workplace-exposure-limits/coal-tar-pitch-volatiles/ | [
"cas_number",
"rel_mgm3",
"substance"
] | null | TWA 0.1 | null | null | null | null | null |
null | 65966-93-2 | null | coal-tar-pitch-volatiles-benzene-soluble-fraction-anthracene-bap-phenanthrene-ac | 0.2 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Coal tar pitch volatiles (benzene soluble fraction), anthracene, BaP, phenanthrene, acridine, chrysene, pyrene | 65966-93-2 | - | 0.2 | - | | Coal tar pitch volatiles (benzene soluble fraction), anthracene, BaP, phenanthrene, acridine, chrysene, pyrene | https://referencesource.org/workplace-exposure-limits/coal-tar-pitch-volatiles-benzene-soluble-fraction-anthracene-bap-phenanthrene-ac/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
null | null | null | coal-tar-pitch-volatiles-i | 0.2 | null | https://www.dir.ca.gov/title8/5155.html | Coal tar pitch volatiles(i) | -- | 0.2 | Coal tar pitch volatiles(i) | https://referencesource.org/workplace-exposure-limits/coal-tar-pitch-volatiles-i/ | [
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-25T00:00:00",
"field": "pel_mgm3",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "Cobalt carbonyl, as Co | -- | 0.1",
"value": "0.1"
}
] | 10210-68-1 | [] | cobalt-carbonyl-as-co | null | null | https://www.cdc.gov/niosh/npg/npgd0147.html | NIOSH REL TWA 0.1 mg/m3 | Cobalt carbonyl (as Co) | https://referencesource.org/workplace-exposure-limits/cobalt-carbonyl-as-co/ | [
"cas_number",
"rel_mgm3",
"substance"
] | null | TWA 0.1 | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/npgd0148.html",
"source_quote": "NIOSH REL TWA 0.1 mg/m3",
"value": "TWA 0.1"
}
] | 16842038 | [] | cobalt-hydrocarbonyl-as-co | 0.1 | null | https://www.dir.ca.gov/title8/5155.html | 16842038 | | Cobalt hydrocarbonyl, as Co | -- | 0.1 | Cobalt hydrocarbonyl, as Co | https://referencesource.org/workplace-exposure-limits/cobalt-hydrocarbonyl-as-co/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/npgd0146.html",
"source_quote": "NIOSH REL TWA 0.05 mg/m3",
"value": "TWA 0.05"
}
] | 7440-48-4 | [
{
"field": "pel_mgm3",
"versions": [
{
"as_of": "2026-08-05T00:00:00",
"source": "https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1",
"source_quote": "Cobalt metal, dust, and fume (as Co) | 7440-48-4 | - | 0.1 | - |",
"value": "0.1"
}... | cobalt-metal-dust-and-fume-as-co | 0.1 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Cobalt metal, dust, and fume (as Co) | 7440-48-4 | - | 0.1 | - | | Cobalt metal, dust, and fume (as Co) | https://referencesource.org/workplace-exposure-limits/cobalt-metal-dust-and-fume-as-co/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
null | null | null | coke-oven-emissions-see-section-5211 | 0.15 | null | https://www.dir.ca.gov/title8/5155.html | Coke oven emissions, see Section 5211 | -- | 0.15 | Coke oven emissions, see Section 5211 | https://referencesource.org/workplace-exposure-limits/coke-oven-emissions-see-section-5211/ | [
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/npgd0150.html",
"source_quote": "NIOSH REL TWA 1 mg/m3",
"value": "TWA 1"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "pel_mgm3",
"source": "https://www.dir.ca.gov/title8/5155.html",... | 7440-50-8 | [] | copper | null | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Copper | 7440-50-8 | - | - | - | | Copper | https://referencesource.org/workplace-exposure-limits/copper/ | [
"cas_number",
"substance"
] | null | null | null | null | null | null | null |
null | 1317-38-0 (CuO) | null | copper-fume-as-cu | null | null | https://www.cdc.gov/niosh/npg/npgd0151.html | NIOSH REL TWA 0.1 mg/m3 | Copper fume (as Cu) | https://referencesource.org/workplace-exposure-limits/copper-fume-as-cu/ | [
"cas_number",
"rel_mgm3",
"substance"
] | null | TWA 0.1 | null | null | null | null | null |
null | null | null | copper-salts-dusts-and-mists-as-cu | 1 | null | https://www.dir.ca.gov/title8/5155.html | Copper salts, dusts and mists, as Cu | -- | 1 | Copper salts, dusts and mists, as Cu | https://referencesource.org/workplace-exposure-limits/copper-salts-dusts-and-mists-as-cu/ | [
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
null | null | null | cotton-dust-see-also-section-5190 | 1(j) | null | https://www.dir.ca.gov/title8/5155.html | Cotton dust, see also Section 5190 | -- | 1(j) | Cotton dust, see also Section 5190 | https://referencesource.org/workplace-exposure-limits/cotton-dust-see-also-section-5190/ | [
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
null | 136-78-7 | [] | crag-herbicide | null | null | https://www.cdc.gov/niosh/npg/npgd0153.html | NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp) | Crag® herbicide | https://referencesource.org/workplace-exposure-limits/crag-herbicide/ | [
"cas_number",
"rel_statement",
"substance"
] | TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp) | null | null | null | null | null | null |
null | 1319-77-3 | [] | cresol-all-isomers | 22 | 5 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Cresol, all isomers | 1319-77-3 | 5 | 22 | X | | Cresol, all isomers | https://referencesource.org/workplace-exposure-limits/cresol-all-isomers/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
null | 14464461 | [] | cristobalite | 0.05 | null | https://www.dir.ca.gov/title8/5155.html | 14464461 | | Cristobalite, | -- | 0.05 | Cristobalite, | https://referencesource.org/workplace-exposure-limits/cristobalite/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-28T00:00:00",
"field": "ceiling",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "123739 | S | Crotonaldehyde; beta-methylacrolein | | | 0.3",
"value": "0.3"
},
{
"as_of": "2026-09-28T00:00:00",
"field": "ceiling_notation",
"source": "htt... | 4170-30-3 | [] | crotonaldehyde | null | null | https://www.cdc.gov/niosh/npg/npgd0157.html | NIOSH REL TWA 2 ppm (6 mg/m3) | Crotonaldehyde | https://referencesource.org/workplace-exposure-limits/crotonaldehyde/ | [
"cas_number",
"rel_mgm3",
"rel_ppm",
"substance"
] | null | 6 | TWA 2 | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/npgd0158.html",
"source_quote": "NIOSH REL TWA 5 mg/m3 ST 20 mg/m3",
"value": "TWA 5"
}
] | 299865 | [] | crufomate | 5 | null | https://www.dir.ca.gov/title8/5155.html | 299865 | | Crufomate | -- | 5 | Crufomate | https://referencesource.org/workplace-exposure-limits/crufomate/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0159.html",
"source_quote": "NIOSH REL TWA 50 ppm (245 mg/m3) [skin]",
"value": "TWA 50"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/nio... | 98-82-8 | [] | cumene | 245 | 50 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Cumene | 98-82-8 | 50 | 245 | X | | Cumene | https://referencesource.org/workplace-exposure-limits/cumene/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/npgd0160.html",
"source_quote": "NIOSH REL TWA 2 mg/m3",
"value": "TWA 2"
}
] | 420042 | [] | cyanamide | 2 | null | https://www.dir.ca.gov/title8/5155.html | 420042 | | Cyanamide | -- | 2 | Cyanamide | https://referencesource.org/workplace-exposure-limits/cyanamide/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
null | null | null | cyanide-as-cn | 5 | null | https://www.dir.ca.gov/title8/5155.html | S | Cyanide, as CN | -- | 5 | Cyanide, as CN | https://referencesource.org/workplace-exposure-limits/cyanide-as-cn/ | [
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0161.html",
"source_quote": "NIOSH REL TWA 10 ppm (20 mg/m3)",
"value": "TWA 10"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/n... | 460195 | [] | cyanogen | 20 | 10 | https://www.dir.ca.gov/title8/5155.html | 460195 | | Cyanogen | 10 | 20 | Cyanogen | https://referencesource.org/workplace-exposure-limits/cyanogen/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0162.html",
"source_quote": "NIOSH REL C 0.3 ppm (0.6 mg/m3)",
"value": "C 0.3"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/np... | 506774 | [] | cyanogen-chloride | 0.6 | 0.3 | https://www.dir.ca.gov/title8/5155.html | 506774 | | Cyanogen chloride | 0.3 | 0.6 | C | Cyanogen chloride | https://referencesource.org/workplace-exposure-limits/cyanogen-chloride/ | [
"cas_number",
"ceiling_notation",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | the values given in the PEL columns are ceiling values | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0163.html",
"source_quote": "NIOSH REL TWA 300 ppm (1050 mg/m3)",
"value": "TWA 300"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/n... | 110-82-7 | [] | cyclohexane | 1050 | 300 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Cyclohexane | 110-82-7 | 300 | 1050 | - | | Cyclohexane | https://referencesource.org/workplace-exposure-limits/cyclohexane/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
null | 1569-69-3 | null | cyclohexanethiol | null | null | https://www.cdc.gov/niosh/npg/npgd0164.html | NIOSH REL C 0.5 ppm (2.4 mg/m3) [15-minute] | Cyclohexanethiol | https://referencesource.org/workplace-exposure-limits/cyclohexanethiol/ | [
"cas_number",
"rel_mgm3",
"rel_ppm",
"substance"
] | null | 2.4 | C 0.5 | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0165.html",
"source_quote": "NIOSH REL TWA 50 ppm (200 mg/m3) [skin]",
"value": "TWA 50"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/nio... | 108-93-0 | [] | cyclohexanol | 200 | 50 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Cyclohexanol | 108-93-0 | 50 | 200 | - | | Cyclohexanol | https://referencesource.org/workplace-exposure-limits/cyclohexanol/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0166.html",
"source_quote": "NIOSH REL TWA 25 ppm (100 mg/m3) [skin]",
"value": "TWA 25"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/nio... | 108-94-1 | [
{
"field": "pel_ppm",
"versions": [
{
"as_of": "2026-08-05T00:00:00",
"source": "https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1",
"source_quote": "Cyclohexanone | 108-94-1 | 50 | 200 | - |",
"value": "50"
},
{
"as_of"... | cyclohexanone | 200 | 50 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Cyclohexanone | 108-94-1 | 50 | 200 | - | | Cyclohexanone | https://referencesource.org/workplace-exposure-limits/cyclohexanone/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0167.html",
"source_quote": "NIOSH REL TWA 300 ppm (1015 mg/m3)",
"value": "TWA 300"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/n... | 110-83-8 | [] | cyclohexene | 1015 | 300 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Cyclohexene | 110-83-8 | 300 | 1015 | - | | Cyclohexene | https://referencesource.org/workplace-exposure-limits/cyclohexene/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0168.html",
"source_quote": "NIOSH REL TWA 10 ppm (40 mg/m3)",
"value": "TWA 10"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/n... | 108918 | [] | cyclohexylamine | 40 | 10 | https://www.dir.ca.gov/title8/5155.html | 108918 | S | Cyclohexylamine | 10 | 40 | Cyclohexylamine | https://referencesource.org/workplace-exposure-limits/cyclohexylamine/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-08-05T00:00:00",
"field": "pel_mgm3",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "121824 | S | Cyclonite; RDX; cyclotrimethylenetrinitramine | -- | 0.07",
"value": "0.07"
}
] | 121-82-4 | [] | cyclonite | null | null | https://www.cdc.gov/niosh/npg/npgd0169.html | NIOSH REL TWA 1.5 mg/m3 ST 3 mg/m3 [skin] | Cyclonite | https://referencesource.org/workplace-exposure-limits/cyclonite/ | [
"cas_number",
"rel_mgm3",
"substance"
] | null | TWA 1.5 | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0170.html",
"source_quote": "NIOSH REL TWA 75 ppm (200 mg/m3)",
"value": "TWA 75"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/... | 542-92-7 | [] | cyclopentadiene | 200 | 75 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Cyclopentadiene | 542-92-7 | 75 | 200 | - | | Cyclopentadiene | https://referencesource.org/workplace-exposure-limits/cyclopentadiene/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0171.html",
"source_quote": "NIOSH REL TWA 600 ppm (1720 mg/m3)",
"value": "TWA 600"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/n... | 287923 | [] | cyclopentane | 1,720 | 600 | https://www.dir.ca.gov/title8/5155.html | 287923 | | Cyclopentane | 600 | 1,720 | Cyclopentane | https://referencesource.org/workplace-exposure-limits/cyclopentane/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-08-05T00:00:00",
"field": "pel_mgm3",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "13121705 | | Cyhexatin; tricyclohexyltin hydroxide | | 5",
"value": "5"
}
] | 13121-70-5 | [] | cyhexatin | null | null | https://www.cdc.gov/niosh/npg/npgd0172.html | NIOSH REL TWA 5 mg/m3 | Cyhexatin | https://referencesource.org/workplace-exposure-limits/cyhexatin/ | [
"cas_number",
"rel_mgm3",
"substance"
] | null | TWA 5 | null | null | null | null | null |
[
{
"as_of": "2026-08-05T00:00:00",
"field": "pel_mgm3",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "50293 | S | DDT; 1,1,1-trichloro-2,2-bis-(p-chlorophenyl)ethane | -- | 1",
"value": "1"
}
] | 50-29-3 | [] | ddt | null | null | https://www.cdc.gov/niosh/npg/npgd0174.html | NIOSH REL Ca TWA 0.5 mg/m3 | DDT | https://referencesource.org/workplace-exposure-limits/ddt/ | [
"cas_number",
"rel_mgm3",
"substance"
] | null | TWA 0.5 | null | null | null | null | null |
[
{
"as_of": "2026-08-05T00:00:00",
"field": "stel_ppm",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "17702419 | S | Decaborane | 0.05 | 0.3 | | 0.15 | 0.9",
"value": "0.15"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "stel_mgm3",
"source": "https://www.d... | 17702-41-9 | [] | decaborane | 0.3 | 0.05 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Decaborane | 17702-41-9 | 0.05 | 0.3 | X | | Decaborane | https://referencesource.org/workplace-exposure-limits/decaborane/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-08-05T00:00:00",
"field": "pel_ppm",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "8065483 | S | Demeton; a mixture of o,o-diethyl o-2(ethylthio)ethyl phosphorothloate and o,o'-diethyl S-2(ethylthio)ethyl phosphorothioate | 0.01 | 0.1",
"value": "0.01"
... | 8065-48-3 | [] | demeton | null | null | https://www.cdc.gov/niosh/npg/npgd0177.html | NIOSH REL TWA 0.1 mg/m3 [skin] | Demeton | https://referencesource.org/workplace-exposure-limits/demeton/ | [
"cas_number",
"rel_mgm3",
"substance"
] | null | TWA 0.1 | null | null | null | null | null |
[
{
"as_of": "2026-08-05T00:00:00",
"field": "pel_mgm3",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "117817 | | Di-sec-octyl phthalate; bis(2 ethylhexyl) phthalate | -- | 5 | | --",
"value": "5"
}
] | 117-81-7 | [] | di-sec-octyl-phthalate | null | null | https://www.cdc.gov/niosh/npg/npgd0236.html | NIOSH REL Ca TWA 5 mg/m3 ST 10 mg/m3 | Di-sec octyl phthalate | https://referencesource.org/workplace-exposure-limits/di-sec-octyl-phthalate/ | [
"cas_number",
"rel_mgm3",
"substance"
] | null | TWA 5 | null | null | null | null | null |
[
{
"as_of": "2026-08-05T00:00:00",
"field": "pel_ppm",
"source": "https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1",
"source_quote": "Diacetone alcohol (4-Hydroxy-4-methyl-2-pentanone) | 123-42-2 | 50 | 240 | - |",
"value": "50"
},
{
"as_of": "2026-08-05T00:... | 123-42-2 | [] | diacetone-alcohol | null | null | https://www.cdc.gov/niosh/npg/npgd0178.html | NIOSH REL TWA 50 ppm (240 mg/m3) | Diacetone alcohol | https://referencesource.org/workplace-exposure-limits/diacetone-alcohol/ | [
"cas_number",
"rel_mgm3",
"rel_ppm",
"substance"
] | null | 240 | TWA 50 | null | null | null | null |
[
{
"as_of": "2026-08-05T00:00:00",
"field": "pel_mgm3",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "333415 | S | Diazinon; o,o-diethyl o-(2-isopropyl-6-methyl-4-pyrimidinyl) phosphorothioate | -- | 0.1",
"value": "0.1"
}
] | 333-41-5 | [] | diazinon | null | null | https://www.cdc.gov/niosh/npg/npgd0181.html | NIOSH REL TWA 0.1 mg/m3 [skin] | Diazinon® | https://referencesource.org/workplace-exposure-limits/diazinon/ | [
"cas_number",
"rel_mgm3",
"substance"
] | null | TWA 0.1 | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0182.html",
"source_quote": "NIOSH REL TWA 0.2 ppm (0.4 mg/m3)",
"value": "TWA 0.2"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/np... | 334-88-3 | [] | diazomethane | 0.4 | 0.2 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Diazomethane | 334-88-3 | 0.2 | 0.4 | - | | Diazomethane | https://referencesource.org/workplace-exposure-limits/diazomethane/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0183.html",
"source_quote": "NIOSH REL TWA 0.1 ppm (0.1 mg/m3)",
"value": "TWA 0.1"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/np... | 19287-45-7 | [] | diborane | 0.1 | 0.1 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Diborane | 19287-45-7 | 0.1 | 0.1 | - | | Diborane | https://referencesource.org/workplace-exposure-limits/diborane/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
null | 2528361 | null | dibutyl-phenyl-phosphate | 3.5 | 0.3 | https://www.dir.ca.gov/title8/5155.html | 2528361 | S | Dibutyl phenyl phosphate | 0.3 | 3.5 | Dibutyl phenyl phosphate | https://referencesource.org/workplace-exposure-limits/dibutyl-phenyl-phosphate/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-08-05T00:00:00",
"field": "stel_ppm",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "107664 | | Dibutyl phosphate | 1 | 5 | | 2 | 10",
"value": "2"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "stel_mgm3",
"source": "https://www.dir.ca.gov... | 107-66-4 | [] | dibutyl-phosphate | 5 | 1 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Dibutyl phosphate | 107-66-4 | 1 | 5 | - | | Dibutyl phosphate | https://referencesource.org/workplace-exposure-limits/dibutyl-phosphate/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/npgd0187.html",
"source_quote": "NIOSH REL TWA 5 mg/m3",
"value": "TWA 5"
}
] | 84-74-2 | [] | dibutyl-phthalate | 5 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Dibutyl phthalate | 84-74-2 | - | 5 | - | | Dibutyl phthalate | https://referencesource.org/workplace-exposure-limits/dibutyl-phthalate/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0188.html",
"source_quote": "NIOSH REL Ca C 0.1 ppm (0.4 mg/m3)",
"value": "C 0.1"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg... | 7572294 | [] | dichloroacetylene | 0.4 | 0.1 | https://www.dir.ca.gov/title8/5155.html | 7572294 | | Dichloroacetylene | 0.1 | 0.4 | C | Dichloroacetylene | https://referencesource.org/workplace-exposure-limits/dichloroacetylene/ | [
"cas_number",
"ceiling_notation",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | the values given in the PEL columns are ceiling values | null | null | null |
[
{
"as_of": "2026-09-28T00:00:00",
"field": "ceiling",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "75718 | | Dichlorodifluoromethane | 1000 | 4950 | 6200 ppm",
"value": "6200 ppm"
},
{
"as_of": "2026-09-28T00:00:00",
"field": "ceiling_notation",
"source":... | 75-71-8 | [] | dichlorodifluoromethane | 4950 | 1000 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Dichlorodifluoromethane | 75-71-8 | 1000 | 4950 | - | | Dichlorodifluoromethane | https://referencesource.org/workplace-exposure-limits/dichlorodifluoromethane/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0196.html",
"source_quote": "NIOSH REL Ca TWA 5 ppm (30 mg/m3) ST 10 ppm (60 mg/m3) [skin]",
"value": "TWA 5"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "ht... | 111-44-4 | [
{
"field": "pel_ppm",
"versions": [
{
"as_of": "2026-08-05T00:00:00",
"source": "https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1",
"source_quote": "Dichloroethyl ether | 111-44-4 | (C)15 | (C)90 | X |",
"value": "(C)15"
},
{
... | dichloroethyl-ether | (C)90 | (C)15 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Dichloroethyl ether | 111-44-4 | (C)15 | (C)90 | X | | Dichloroethyl ether | https://referencesource.org/workplace-exposure-limits/dichloroethyl-ether/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0197.html",
"source_quote": "NIOSH REL TWA 10 ppm (40 mg/m3)",
"value": "TWA 10"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/n... | 75434 | [
{
"field": "pel_ppm",
"versions": [
{
"as_of": "2026-08-05T00:00:00",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "75434 | | Dichlorofluoromethane; Fluorocarbon 21 | 10 | 42",
"value": "10"
},
{
"as_of": "2026-08-05T00:00:00"... | dichlorofluoromethane-fluorocarbon-21 | 42 | 10 | https://www.dir.ca.gov/title8/5155.html | 75434 | | Dichlorofluoromethane; Fluorocarbon 21 | 10 | 42 | Dichlorofluoromethane; Fluorocarbon 21 | https://referencesource.org/workplace-exposure-limits/dichlorofluoromethane-fluorocarbon-21/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-08-05T00:00:00",
"field": "pel_mgm3",
"source": "https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1",
"source_quote": "Dichlorvos (DDVP) | 62-73-7 | - | 1 | X |",
"value": "1"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "pel_ppm",
"... | 62-73-7 | [] | dichlorvos | null | null | https://www.cdc.gov/niosh/npg/npgd0202.html | NIOSH REL TWA 1 mg/m3 [skin] | Dichlorvos | https://referencesource.org/workplace-exposure-limits/dichlorvos/ | [
"cas_number",
"rel_mgm3",
"substance"
] | null | TWA 1 | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/npgd0203.html",
"source_quote": "NIOSH REL TWA 0.25 mg/m3 [skin]",
"value": "TWA 0.25"
}
] | 141662 | [] | dicrotophos | 0.25 | null | https://www.dir.ca.gov/title8/5155.html | 141662 | S | Dicrotophos | -- | 0.25 | Dicrotophos | https://referencesource.org/workplace-exposure-limits/dicrotophos/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0204.html",
"source_quote": "NIOSH REL TWA 5 ppm (30 mg/m3)",
"value": "TWA 5"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/npg... | 77736 | [] | dicyclopentadiene | 30 | 5 | https://www.dir.ca.gov/title8/5155.html | 77736 | | Dicyclopentadiene | 5 | 30 | Dicyclopentadiene | https://referencesource.org/workplace-exposure-limits/dicyclopentadiene/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_statement",
"source": "https://www.cdc.gov/niosh/npg/npgd0205.html",
"source_quote": "NIOSH REL TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)",
"value": "TWA 10 mg/m3 (total) TWA 5 mg/m3 (resp)"
}
] | 102-54-5 | [] | dicyclopentadienyl-iron | null | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Dicyclopentadienyl iron | 102-54-5 | - | - | - | | Dicyclopentadienyl iron | https://referencesource.org/workplace-exposure-limits/dicyclopentadienyl-iron/ | [
"cas_number",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/npgd0206.html",
"source_quote": "NIOSH REL Ca TWA 0.25 mg/m3 [skin]",
"value": "TWA 0.25"
}
] | 60-57-1 | [] | dieldrin | 0.25 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Dieldrin | 60-57-1 | - | 0.25 | X | | Dieldrin | https://referencesource.org/workplace-exposure-limits/dieldrin/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0208.html",
"source_quote": "NIOSH REL TWA 3 ppm (15 mg/m3)",
"value": "TWA 3"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/npg... | 111422 | [] | diethanolamine | 2 | 0.46 | https://www.dir.ca.gov/title8/5155.html | 111422 | S | Diethanolamine | 0.46 | 2 | Diethanolamine | https://referencesource.org/workplace-exposure-limits/diethanolamine/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0212.html",
"source_quote": "NIOSH REL TWA 200 ppm (705 mg/m3)",
"value": "TWA 200"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/np... | 96220 | [] | diethyl-ketone | 705 | 200 | https://www.dir.ca.gov/title8/5155.html | 96220 | | Diethyl ketone | 200 | 705 | | 300 | 1057 | Diethyl ketone | https://referencesource.org/workplace-exposure-limits/diethyl-ketone/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"stel_mgm3",
"stel_ppm",
"substance"
] | null | null | null | null | 1057 | 300 | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/npgd0213.html",
"source_quote": "NIOSH REL TWA 5 mg/m3",
"value": "TWA 5"
}
] | 84662 | [] | diethyl-phthalate | 5 | null | https://www.dir.ca.gov/title8/5155.html | 84662 | | Diethyl phthalate | -- | 5 | Diethyl phthalate | https://referencesource.org/workplace-exposure-limits/diethyl-phthalate/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-28T00:00:00",
"field": "ceiling_notation",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "109897 | S | Diethylamine | 5 | 15 | C",
"value": "the values given in the PEL columns are ceiling values"
},
{
"as_of": "2026-09-08T00:00:00",
"field"... | 109-89-7 | [
{
"field": "pel_ppm",
"versions": [
{
"as_of": "2026-08-05T00:00:00",
"source": "https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1",
"source_quote": "Diethylamine | 109-89-7 | 25 | 75 | - |",
"value": "25"
},
{
"as_of": ... | diethylamine | 75 | 25 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Diethylamine | 109-89-7 | 25 | 75 | - | | Diethylamine | https://referencesource.org/workplace-exposure-limits/diethylamine/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
null | 112367 | null | diethylene-glycol-diethyl-ether-ethyl-diglyme | 33 | 5 | https://www.dir.ca.gov/title8/5155.html | 112367 | S | Diethylene glycol diethyl ether, Ethyl diglyme | 5 | 33 | Diethylene glycol diethyl ether, Ethyl diglyme | https://referencesource.org/workplace-exposure-limits/diethylene-glycol-diethyl-ether-ethyl-diglyme/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
null | 111966 | null | diethylene-glycol-dimethyl-ether-diglyme | 5.5 | 1 | https://www.dir.ca.gov/title8/5155.html | 111966 | S | Diethylene glycol dimethyl ether, Diglyme | 1 | 5.5 | | 5 | 27 | Diethylene glycol dimethyl ether, Diglyme | https://referencesource.org/workplace-exposure-limits/diethylene-glycol-dimethyl-ether-diglyme/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"stel_mgm3",
"stel_ppm",
"substance"
] | null | null | null | null | 27 | 5 | null |
[
{
"as_of": "2026-09-25T00:00:00",
"field": "pel_ppm",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "111400S | | Diethylenetriamine | 1 | 4",
"value": "1"
},
{
"as_of": "2026-09-25T00:00:00",
"field": "pel_mgm3",
"source": "https://www.dir.ca.gov/title8/515... | 111-40-0 | [] | diethylenetriamine | null | null | https://www.cdc.gov/niosh/npg/npgd0211.html | NIOSH REL TWA 1 ppm (4 mg/m3) [skin] | Diethylenetriamine | https://referencesource.org/workplace-exposure-limits/diethylenetriamine/ | [
"cas_number",
"rel_mgm3",
"rel_ppm",
"substance"
] | null | 4 | TWA 1 | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0214.html",
"source_quote": "NIOSH REL TWA 100 ppm (860 mg/m3)",
"value": "TWA 100"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/np... | 75-61-6 | [] | difluorodibromomethane | 860 | 100 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Difluorodibromomethane | 75-61-6 | 100 | 860 | - | | Difluorodibromomethane | https://referencesource.org/workplace-exposure-limits/difluorodibromomethane/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-08-05T00:00:00",
"field": "pel_ppm",
"source": "https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1",
"source_quote": "Diglycidyl ether (DGE) | 2238-07-5 | (C)0.5 | (C)2.8 | - |",
"value": "(C)0.5"
},
{
"as_of": "2026-08-05T00:00:00",
"fie... | 2238-07-5 | [] | diglycidyl-ether | null | null | https://www.cdc.gov/niosh/npg/npgd0215.html | NIOSH REL Ca TWA 0.1 ppm (0.5 mg/m3) | Diglycidyl ether | https://referencesource.org/workplace-exposure-limits/diglycidyl-ether/ | [
"cas_number",
"rel_mgm3",
"rel_ppm",
"substance"
] | null | 0.5 | TWA 0.1 | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0216.html",
"source_quote": "NIOSH REL TWA 25 ppm (150 mg/m3)",
"value": "TWA 25"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/... | 108-83-8 | [
{
"field": "pel_ppm",
"versions": [
{
"as_of": "2026-08-05T00:00:00",
"source": "https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1",
"source_quote": "Diisobutyl ketone | 108-83-8 | 50 | 290 | - |",
"value": "50"
},
{
"as... | diisobutyl-ketone | 290 | 50 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Diisobutyl ketone | 108-83-8 | 50 | 290 | - | | Diisobutyl ketone | https://referencesource.org/workplace-exposure-limits/diisobutyl-ketone/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0217.html",
"source_quote": "NIOSH REL TWA 5 ppm (20 mg/m3) [skin]",
"value": "TWA 5"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/... | 108-18-9 | [] | diisopropylamine | 20 | 5 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Diisopropylamine | 108-18-9 | 5 | 20 | X | | Diisopropylamine | https://referencesource.org/workplace-exposure-limits/diisopropylamine/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-08-05T00:00:00",
"field": "pel_mgm3",
"source": "https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1",
"source_quote": "Dimethyl-1,2-dibromo-2,2-dichloroethyl phosphate | 300-76-5 | - | 3 | - |",
"value": "3"
}
] | 300-76-5 | [] | dimethyl-1-2-dibromo-2-2-dichlorethyl-phosphate | null | null | https://www.cdc.gov/niosh/npg/npgd0225.html | NIOSH REL TWA 3 mg/m3 [skin] | Dimethyl-1,2-dibromo-2,2-dichlorethyl phosphate | https://referencesource.org/workplace-exposure-limits/dimethyl-1-2-dibromo-2-2-dichlorethyl-phosphate/ | [
"cas_number",
"rel_mgm3",
"substance"
] | null | TWA 3 | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0218.html",
"source_quote": "NIOSH REL TWA 10 ppm (35 mg/m3) [skin]",
"value": "TWA 10"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/nios... | 127-19-5 | [] | dimethyl-acetamide | 35 | 10 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Dimethyl acetamide | 127-19-5 | 10 | 35 | X | | Dimethyl acetamide | https://referencesource.org/workplace-exposure-limits/dimethyl-acetamide/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
null | 79-44-7 | null | dimethyl-carbamoyl-chloride | null | null | https://www.cdc.gov/niosh/npg/npgd0224.html | NIOSH REL Ca See Appendix A | Dimethyl carbamoyl chloride | https://referencesource.org/workplace-exposure-limits/dimethyl-carbamoyl-chloride/ | [
"cas_number",
"rel_statement",
"substance"
] | Ca See Appendix A | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/npgd0228.html",
"source_quote": "NIOSH REL TWA 5 mg/m3",
"value": "TWA 5"
}
] | 131113 | [] | dimethyl-phthalate | 5 | null | https://www.dir.ca.gov/title8/5155.html | 131113 | | Dimethyl phthalate | -- | 5 | Dimethyl phthalate | https://referencesource.org/workplace-exposure-limits/dimethyl-phthalate/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0229.html",
"source_quote": "NIOSH REL Ca TWA 0.1 ppm (0.5 mg/m3) [skin]",
"value": "TWA 0.1"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.go... | 77-78-1 | [
{
"field": "pel_ppm",
"versions": [
{
"as_of": "2026-08-05T00:00:00",
"source": "https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1",
"source_quote": "Dimethyl sulfate | 77-78-1 | 1 | 5 | X |",
"value": "1"
},
{
"as_of": ... | dimethyl-sulfate | 5 | 1 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Dimethyl sulfate | 77-78-1 | 1 | 5 | X | | Dimethyl sulfate | https://referencesource.org/workplace-exposure-limits/dimethyl-sulfate/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-08-05T00:00:00",
"field": "stel_ppm",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "124403 | | Dimethylamine | 5 | 9.2 | | 15 | 27.6",
"value": "15"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "stel_mgm3",
"source": "https://www.dir.ca.g... | 124-40-3 | [
{
"field": "pel_ppm",
"versions": [
{
"as_of": "2026-08-05T00:00:00",
"source": "https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1",
"source_quote": "Dimethylamine | 124-40-3 | 10 | 18 | - |",
"value": "10"
},
{
"as_of":... | dimethylamine | 18 | 10 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Dimethylamine | 124-40-3 | 10 | 18 | - | | Dimethylamine | https://referencesource.org/workplace-exposure-limits/dimethylamine/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
null | 1738-25-6 | null | dimethylaminopropionitrile | null | null | https://www.cdc.gov/niosh/npg/npgd0222.html | NIOSH REL See Appendix C (NIAX® Catalyst ESN) | Dimethylaminopropionitrile | https://referencesource.org/workplace-exposure-limits/dimethylaminopropionitrile/ | [
"cas_number",
"rel_statement",
"substance"
] | See Appendix C (NIAX® Catalyst ESN) | null | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0223.html",
"source_quote": "NIOSH REL TWA 5 ppm (25 mg/m3) ST 10 ppm (50 mg/m3) [skin]",
"value": "TWA 5"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https... | 121-69-7 | [] | dimethylaniline-n-n-dimethylaniline | 25 | 5 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Dimethylaniline (N,N-Dimethylaniline) | 121-69-7 | 5 | 25 | X | | Dimethylaniline (N,N-Dimethylaniline) | https://referencesource.org/workplace-exposure-limits/dimethylaniline-n-n-dimethylaniline/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
null | 14857342 | null | dimethylethoxysilane | 2.1 | 0.5 | https://www.dir.ca.gov/title8/5155.html | 14857342 | | Dimethylethoxysilane | 0.5 | 2.1 | | 1.5 | 6.4 | Dimethylethoxysilane | https://referencesource.org/workplace-exposure-limits/dimethylethoxysilane/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"stel_mgm3",
"stel_ppm",
"substance"
] | null | null | null | null | 6.4 | 1.5 | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0226.html",
"source_quote": "NIOSH REL TWA 10 ppm (30 mg/m3) [skin]",
"value": "TWA 10"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/nios... | 68-12-2 | [] | dimethylformamide | 30 | 10 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Dimethylformamide | 68-12-2 | 10 | 30 | X | | Dimethylformamide | https://referencesource.org/workplace-exposure-limits/dimethylformamide/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-08-05T00:00:00",
"field": "pel_mgm3",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "148016 | | Dinitolmide; 3,5-Dinitro-o-toluamide | -- | 5",
"value": "5"
}
] | 148-01-6 | [] | dinitolmide | null | null | https://www.cdc.gov/niosh/npg/npgd0230.html | NIOSH REL TWA 5 mg/m3 | Dinitolmide | https://referencesource.org/workplace-exposure-limits/dinitolmide/ | [
"cas_number",
"rel_mgm3",
"substance"
] | null | TWA 5 | null | null | null | null | null |
null | 528290, 99650, 100254 | null | dinitrobenzene-all-isomers-ortho-meta-and-para-isomers | 1 | 0.15 | https://www.dir.ca.gov/title8/5155.html | 528290, 99650, 100254 | S | Dinitrobenzene (all (isomers) ortho, meta and para isomers | 0.15 | 1 | Dinitrobenzene (all (isomers) ortho, meta and para isomers | https://referencesource.org/workplace-exposure-limits/dinitrobenzene-all-isomers-ortho-meta-and-para-isomers/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-08-05T00:00:00",
"field": "pel_ppm",
"source": "https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1",
"source_quote": "Dioxane (Diethylene dioxide) | 123-91-1 | 100 | 360 | X |",
"value": "100"
},
{
"as_of": "2026-08-05T00:00:00",
"field":... | 123-91-1 | [] | dioxane | null | null | https://www.cdc.gov/niosh/npg/npgd0237.html | NIOSH REL Ca C 1 ppm (3.6 mg/m3) [30-minute] | Dioxane | https://referencesource.org/workplace-exposure-limits/dioxane/ | [
"cas_number",
"rel_mgm3",
"rel_ppm",
"substance"
] | null | 3.6 | C 1 | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/npgd0238.html",
"source_quote": "NIOSH REL TWA 0.2 mg/m3 [skin]",
"value": "TWA 0.2"
}
] | 78342 | [] | dioxathion | 0.2 | null | https://www.dir.ca.gov/title8/5155.html | 78342 | S | Dioxathion | -- | 0.2 | Dioxathion | https://referencesource.org/workplace-exposure-limits/dioxathion/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
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