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": "pel_ppm",
"source": "https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1",
"source_quote": "Methylal (Dimethoxy-methane) | 109-87-5 | 1000 | 3100 | - |",
"value": "1000"
},
{
"as_of": "2026-08-05T00:00:00",
"fiel... | 109-87-5 | [] | methylal | null | null | https://www.cdc.gov/niosh/npg/npgd0396.html | NIOSH REL TWA 1000 ppm (3100 mg/m3) | Methylal | https://referencesource.org/workplace-exposure-limits/methylal/ | [
"cas_number",
"rel_mgm3",
"rel_ppm",
"substance"
] | null | 3100 | TWA 1000 | 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": "74895 | | Methylamine | 5 | 6.4 | | 15 | 19",
"value": "15"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "stel_mgm3",
"source": "https://www.dir.ca.gov/ti... | 74-89-5 | [
{
"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": "Methylamine | 74-89-5 | 10 | 12 | - |",
"value": "10"
},
{
"as_of": "2... | methylamine | 12 | 10 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Methylamine | 74-89-5 | 10 | 12 | - | | Methylamine | https://referencesource.org/workplace-exposure-limits/methylamine/ | [
"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/npgd0406.html",
"source_quote": "NIOSH REL TWA 400 ppm (1600 mg/m3)",
"value": "TWA 400"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/n... | 108-87-2 | [
{
"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": "Methylcyclohexane | 108-87-2 | 500 | 2000 | - |",
"value": "500"
},
{
... | methylcyclohexane | 2000 | 500 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Methylcyclohexane | 108-87-2 | 500 | 2000 | - | | Methylcyclohexane | https://referencesource.org/workplace-exposure-limits/methylcyclohexane/ | [
"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/npgd0407.html",
"source_quote": "NIOSH REL TWA 50 ppm (235 mg/m3)",
"value": "TWA 50"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/... | 25639-42-3 | [
{
"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": "Methylcyclohexanol | 25639-42-3 | 100 | 470 | - |",
"value": "100"
},
{
... | methylcyclohexanol | 470 | 100 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Methylcyclohexanol | 25639-42-3 | 100 | 470 | - | | Methylcyclohexanol | https://referencesource.org/workplace-exposure-limits/methylcyclohexanol/ | [
"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": "5124301 | | Methylene bis(4-cyclohexylisocyanate); hydrogenated MDI | 0.005 | 0.054",
"value": "0.005"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "pel_mgm3",... | 5124-30-1 | [] | methylene-bis-4-cyclohexylisocyanate | null | null | https://www.cdc.gov/niosh/npg/npgd0412.html | NIOSH REL C 0.01 ppm (0.11 mg/m3) | Methylene bis(4-cyclohexylisocyanate) | https://referencesource.org/workplace-exposure-limits/methylene-bis-4-cyclohexylisocyanate/ | [
"cas_number",
"rel_mgm3",
"rel_ppm",
"substance"
] | null | 0.11 | C 0.01 | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0413.html",
"source_quote": "NIOSH REL TWA 0.05 mg/m3 (0.005 ppm) C 0.2 mg/m3 (0.020 ppm) [10-minute]",
"value": "0.005"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"s... | 101688 | [
{
"field": "pel_ppm",
"versions": [
{
"as_of": "2026-08-05T00:00:00",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "101688 | | Methylene bis(phenylisocyanate); MDI; diphenylmethane diisocyanate | 0.005 | 0.051",
"value": "0.005"
},
{
... | methylene-bis-phenylisocyanate-mdi-diphenylmethane-diisocyanate | 0.051 | 0.005 | https://www.dir.ca.gov/title8/5155.html | 101688 | | Methylene bis(phenylisocyanate); MDI; diphenylmethane diisocyanate | 0.005 | 0.051 | Methylene bis(phenylisocyanate); MDI; diphenylmethane diisocyanate | https://referencesource.org/workplace-exposure-limits/methylene-bis-phenylisocyanate-mdi-diphenylmethane-diisocyanate/ | [
"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/npgd0414.html",
"source_quote": "NIOSH REL Ca See Appendix A",
"value": "Ca See Appendix A"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "pel_ppm",
"source": "https://www.dir.ca.... | 75-09-2 | [] | methylene-chloride | null | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Methylene chloride | 75-09-2 | - | (2) | - | | Methylene chloride | https://referencesource.org/workplace-exposure-limits/methylene-chloride/ | [
"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/npgd0430.html",
"source_quote": "NIOSH REL TWA 5 mg/m3",
"value": "TWA 5"
}
] | 21087649 | [] | metribuzin | 5 | null | https://www.dir.ca.gov/title8/5155.html | 21087649 | | Metribuzin | -- | 5 | Metribuzin | https://referencesource.org/workplace-exposure-limits/metribuzin/ | [
"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/npgd0503.html",
"source_quote": "NIOSH REL TWA 0.01 ppm (0.1 mg/m3) ST 0.03 ppm (0.3 mg/m3) [skin]",
"value": "TWA 0.01"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"sourc... | 7786347 | [] | mevinphos-2-carbomethoxyl-1-propen-2-yl-dimethyl-phosphate | 0.1 | 0.01 | https://www.dir.ca.gov/title8/5155.html | 7786347 | S | Mevinphos; 2-carbomethoxyl-1-propen-2-yl dimethyl phosphate | 0.01 | 0.1 | | 0.03 | 0.3 | Mevinphos; 2-carbomethoxyl-1-propen-2-yl dimethyl phosphate | https://referencesource.org/workplace-exposure-limits/mevinphos-2-carbomethoxyl-1-propen-2-yl-dimethyl-phosphate/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"stel_mgm3",
"stel_ppm",
"substance"
] | null | null | null | null | 0.3 | 0.03 | null |
[
{
"as_of": "2026-08-05T00:00:00",
"field": "pel_mgm3",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "12001262 | | Mica (respirable dust) | -- | 3",
"value": "3"
}
] | 12001-26-2 | [] | mica-containing-less-than-1-quartz | null | null | https://www.cdc.gov/niosh/npg/npgd0431.html | NIOSH REL TWA 3 mg/m3 (resp) | Mica (containing less than 1% quartz) | https://referencesource.org/workplace-exposure-limits/mica-containing-less-than-1-quartz/ | [
"cas_number",
"rel_statement",
"substance"
] | TWA 3 mg/m3 (resp) | 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": "7439987 | | Molybdenum, insoluble compounds, as Mo | -- | 0.5(n)",
"value": "0.5(n)"
}
] | 7439-98-7 | [] | molybdenum | null | null | https://www.cdc.gov/niosh/npg/npgd0433.html | NIOSH REL See Appendix D | Molybdenum | https://referencesource.org/workplace-exposure-limits/molybdenum/ | [
"cas_number",
"rel_statement",
"substance"
] | See Appendix D | null | null | null | null | null | null |
null | null | null | molybdenum-soluble-compounds-as-mo | 0.5(n) | null | https://www.dir.ca.gov/title8/5155.html | Molybdenum, soluble compounds, as Mo | -- | 0.5(n) | Molybdenum, soluble compounds, as Mo | https://referencesource.org/workplace-exposure-limits/molybdenum-soluble-compounds-as-mo/ | [
"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/npgd0435.html",
"source_quote": "NIOSH REL TWA 0.25 mg/m3",
"value": "TWA 0.25"
}
] | 6923224 | [] | monocrotophos | 0.25 | null | https://www.dir.ca.gov/title8/5155.html | 6923224 | | Monocrotophos | -- | 0.25 | Monocrotophos | https://referencesource.org/workplace-exposure-limits/monocrotophos/ | [
"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/npgd0436.html",
"source_quote": "NIOSH REL TWA 0.5 ppm (2 mg/m3) [skin]",
"value": "TWA 0.5"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/nio... | 100-61-8 | [
{
"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": "Monomethyl aniline | 100-61-8 | 2 | 9 | X |",
"value": "2"
},
{
"as_of... | monomethyl-aniline | 9 | 2 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Monomethyl aniline | 100-61-8 | 2 | 9 | X | | Monomethyl aniline | https://referencesource.org/workplace-exposure-limits/monomethyl-aniline/ | [
"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/npgd0437.html",
"source_quote": "NIOSH REL TWA 20 ppm (70 mg/m3) ST 30 ppm (105 mg/m3) [skin]",
"value": "TWA 20"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "ht... | 110-91-8 | [] | morpholine | 70 | 20 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Morpholine | 110-91-8 | 20 | 70 | X | | Morpholine | https://referencesource.org/workplace-exposure-limits/morpholine/ | [
"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/npgd0031.html",
"source_quote": "NIOSH REL TWA 100 ppm (525 mg/m3)",
"value": "TWA 100"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/np... | 628-63-7 | [] | n-amyl-acetate | 525 | 100 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | n-Amyl acetate | 628-63-7 | 100 | 525 | - | | n-Amyl acetate | https://referencesource.org/workplace-exposure-limits/n-amyl-acetate/ | [
"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": "123864 | | n-Butyl acetate | 150 | 710 | | 200 | 950",
"value": "200"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "stel_mgm3",
"source": "https://www.dir... | 123-86-4 | [] | n-butyl-acetate | 710 | 150 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | n-Butyl-acetate | 123-86-4 | 150 | 710 | - | | n-Butyl-acetate | https://referencesource.org/workplace-exposure-limits/n-butyl-acetate/ | [
"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": "71363 | S | n-Butyl alcohol; 1-butanol | 50 | 150 | C",
"value": "the values given in the PEL columns are ceiling values"
},
{
"as_of": "2026-09-08T00:00:0... | 71-36-3 | [
{
"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": "n-Butyl alcohol | 71-36-3 | 100 | 300 | - |",
"value": "100"
},
{
"as_... | n-butyl-alcohol | 300 | 100 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | n-Butyl alcohol | 71-36-3 | 100 | 300 | - | | n-Butyl alcohol | https://referencesource.org/workplace-exposure-limits/n-butyl-alcohol/ | [
"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": "n-Butyl glycidyl ether (BGE) | 2426-08-6 | 50 | 270 | - |",
"value": "50"
},
{
"as_of": "2026-08-05T00:00:00",
"field": ... | 2426-08-6 | [] | n-butyl-glycidyl-ether | null | null | https://www.cdc.gov/niosh/npg/npgd0081.html | NIOSH REL C 5.6 ppm (30 mg/m3) [15-minute] | n-Butyl glycidyl ether | https://referencesource.org/workplace-exposure-limits/n-butyl-glycidyl-ether/ | [
"cas_number",
"rel_mgm3",
"rel_ppm",
"substance"
] | null | 30 | C 5.6 | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0082.html",
"source_quote": "NIOSH REL TWA 5 ppm (25 mg/m3)",
"value": "TWA 5"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/npg... | 138227 | [] | n-butyl-lactate | 25 | 5 | https://www.dir.ca.gov/title8/5155.html | 138227 | | n-Butyl lactate | 5 | 25 | n-Butyl lactate | https://referencesource.org/workplace-exposure-limits/n-butyl-lactate/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
null | 109-74-0 | null | n-butyronitrile | null | null | https://www.cdc.gov/niosh/npg/npgd0086.html | NIOSH REL TWA 8 ppm (22 mg/m3) | n-Butyronitrile | https://referencesource.org/workplace-exposure-limits/n-butyronitrile/ | [
"cas_number",
"rel_mgm3",
"rel_ppm",
"substance"
] | null | 22 | TWA 8 | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0281.html",
"source_quote": "NIOSH REL TWA 5 ppm (23 mg/m3) [skin]",
"value": "TWA 5"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/... | 100-74-3 | [
{
"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": "N-Ethylmorpholine | 100-74-3 | 20 | 94 | X |",
"value": "20"
},
{
"as_... | n-ethylmorpholine | 94 | 20 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | N-Ethylmorpholine | 100-74-3 | 20 | 94 | X | | N-Ethylmorpholine | https://referencesource.org/workplace-exposure-limits/n-ethylmorpholine/ | [
"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/npgd0322.html",
"source_quote": "NIOSH REL TWA 50 ppm (180 mg/m3)",
"value": "TWA 50"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/... | 110-54-3 | [
{
"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": "n-Hexane | 110-54-3 | 500 | 1800 | - |",
"value": "500"
},
{
"as_of": ... | n-hexane | 1800 | 500 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | n-Hexane | 110-54-3 | 500 | 1800 | - | | n-Hexane | https://referencesource.org/workplace-exposure-limits/n-hexane/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
null | 111-31-9 | null | n-hexanethiol | null | null | https://www.cdc.gov/niosh/npg/npgd0324.html | NIOSH REL C 0.5 ppm (2.7 mg/m3) [15-minute] | n-Hexanethiol | https://referencesource.org/workplace-exposure-limits/n-hexanethiol/ | [
"cas_number",
"rel_mgm3",
"rel_ppm",
"substance"
] | null | 2.7 | C 0.5 | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0361.html",
"source_quote": "NIOSH REL TWA 2 ppm (10 mg/m3) [skin]",
"value": "TWA 2"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/... | 768525 | [] | n-isopropylaniline | 10 | 2 | https://www.dir.ca.gov/title8/5155.html | 768525 | S | N-isopropylaniline | 2 | 10 | N-isopropylaniline | https://referencesource.org/workplace-exposure-limits/n-isopropylaniline/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
null | 872504 | null | n-methylpyrrolidone-nmp | 4 | 1 | https://www.dir.ca.gov/title8/5155.html | 872504 | S | N-Methylpyrrolidone (NMP) | 1 | 4 | N-Methylpyrrolidone (NMP) | https://referencesource.org/workplace-exposure-limits/n-methylpyrrolidone-nmp/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
null | 62-75-9 | [] | n-nitrosodimethylamine | null | null | https://www.cdc.gov/niosh/npg/npgd0461.html | NIOSH REL Ca See Appendix A | N-Nitrosodimethylamine | https://referencesource.org/workplace-exposure-limits/n-nitrosodimethylamine/ | [
"cas_number",
"rel_statement",
"substance"
] | Ca See Appendix A | 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": "Pentane | 109-66-0 | 1000 | 2950 | - |",
"value": "1000"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "pel_mgm3",
"... | 109-66-0 | [] | n-pentane | null | null | https://www.cdc.gov/niosh/npg/npgd0486.html | NIOSH REL TWA 120 ppm (350 mg/m3) C 610 ppm (1800 mg/m3) [15-minute] | n-Pentane | https://referencesource.org/workplace-exposure-limits/n-pentane/ | [
"cas_number",
"rel_mgm3",
"rel_ppm",
"substance"
] | null | 350 | TWA 120 | null | null | null | null |
null | 135-88-6 | null | n-phenyl-naphthylamine | null | null | https://www.cdc.gov/niosh/npg/npgd0500.html | NIOSH REL Ca* See Appendix A | N-Phenyl-β-naphthylamine | https://referencesource.org/workplace-exposure-limits/n-phenyl-naphthylamine/ | [
"cas_number",
"rel_statement",
"substance"
] | Ca* See Appendix A | 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": "109604 | | n-Propyl acetate | 200 | 840 | | 250 | 1050",
"value": "250"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "stel_mgm3",
"source": "https://www.d... | 109-60-4 | [] | n-propyl-acetate | 840 | 200 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | n-Propyl acetate | 109-60-4 | 200 | 840 | - | | n-Propyl acetate | https://referencesource.org/workplace-exposure-limits/n-propyl-acetate/ | [
"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": "71238 | S | n-Propyl alcohol | 200 | 500 | | 250 | 625",
"value": "250"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "stel_mgm3",
"source": "https://www.d... | 71-23-8 | [] | n-propyl-alcohol | 500 | 200 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | n-Propyl alcohol | 71-23-8 | 200 | 500 | - | | n-Propyl alcohol | https://referencesource.org/workplace-exposure-limits/n-propyl-alcohol/ | [
"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": "627134 | | n-Propyl nitrate | 25 | 107 | | 40 | 170",
"value": "40"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "stel_mgm3",
"source": "https://www.dir.c... | 627-13-4 | [
{
"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": "n-Propyl nitrate | 627-13-4 | 25 | 110 | - |",
"value": "110"
},
{
"a... | n-propyl-nitrate | 110 | 25 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | n-Propyl nitrate | 627-13-4 | 25 | 110 | - | | n-Propyl nitrate | https://referencesource.org/workplace-exposure-limits/n-propyl-nitrate/ | [
"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": "110623 | | Valeraldehyde | 50 | 175",
"value": "50"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "pel_mgm3",
"source": "https://www.dir.ca.gov/title8/5155.... | 110-62-3 | [] | n-valeraldehyde | null | null | https://www.cdc.gov/niosh/npg/npgd0652.html | NIOSH REL TWA 50 ppm (175 mg/m3) | n-Valeraldehyde | https://referencesource.org/workplace-exposure-limits/n-valeraldehyde/ | [
"cas_number",
"rel_mgm3",
"rel_ppm",
"substance"
] | null | 175 | TWA 50 | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0438.html",
"source_quote": "NIOSH REL TWA 100 ppm (400 mg/m3)",
"value": "TWA 100"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/np... | 8030-30-6 | [
{
"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": "Naphtha (Coal tar) | 8030-30-6 | 100 | 400 | - |",
"value": "100"
},
{
... | naphtha-coal-tar | 400 | 100 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Naphtha (Coal tar) | 8030-30-6 | 100 | 400 | - | | Naphtha (Coal tar) | https://referencesource.org/workplace-exposure-limits/naphtha-coal-tar/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
null | 8030317 | null | naphtha-coal-tar-2 | 400 | 100 | https://www.dir.ca.gov/title8/5155.html | 8030317 | | Naphtha, coal tar | 100 | 400 | Naphtha, coal tar | https://referencesource.org/workplace-exposure-limits/naphtha-coal-tar-2/ | [
"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/npgd0439.html",
"source_quote": "NIOSH REL TWA 10 ppm (50 mg/m3) ST 15 ppm (75 mg/m3)",
"value": "TWA 10"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://ww... | 91-20-3 | [
{
"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": "Naphthalene | 91-20-3 | 10 | 50 | - |",
"value": "10"
},
{
"as_of": "2... | naphthalene | 50 | 10 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Naphthalene | 91-20-3 | 10 | 50 | - | | Naphthalene | https://referencesource.org/workplace-exposure-limits/naphthalene/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
null | 3173-72-6 | null | naphthalene-diisocyanate | null | null | https://www.cdc.gov/niosh/npg/npgd0440.html | NIOSH REL TWA 0.040 mg/m3 (0.005 ppm) C 0.170 mg/m3 (0.020 ppm) [10-minute] | Naphthalene diisocyanate | https://referencesource.org/workplace-exposure-limits/naphthalene-diisocyanate/ | [
"cas_number",
"rel_mgm3",
"rel_ppm",
"substance"
] | null | TWA 0.040 | 0.005 | null | null | null | null |
null | 25551284 | null | naphthalene-diisocyanate-ndi | 0.085 | 0.01 | https://www.dir.ca.gov/title8/5155.html | 25551284 | | Naphthalene diisocyanate; NDI | 0.01 | 0.085 | C | Naphthalene diisocyanate; NDI | https://referencesource.org/workplace-exposure-limits/naphthalene-diisocyanate-ndi/ | [
"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 |
null | 7440019 | null | neon | null | null | https://www.dir.ca.gov/title8/5155.html | 7440019 | | Neon | (h) | Neon | https://referencesource.org/workplace-exposure-limits/neon/ | [
"cas_number",
"substance"
] | null | null | null | null | null | null | null |
null | 62765-93-9 | null | niax-catalyst-esn | null | null | https://www.cdc.gov/niosh/npg/npgd0443.html | NIOSH REL See Appendix C | Niax® Catalyst ESN | https://referencesource.org/workplace-exposure-limits/niax-catalyst-esn/ | [
"cas_number",
"rel_statement",
"substance"
] | See Appendix C | 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": "Nickel carbonyl (as Ni) | 13463-39-3 | 0.001 | 0.007 | - |",
"value": "0.001"
},
{
"as_of": "2026-08-05T00:00:00",
"fiel... | 13463-39-3 | [] | nickel-carbonyl | null | null | https://www.cdc.gov/niosh/npg/npgd0444.html | NIOSH REL Ca TWA 0.001 ppm (0.007 mg/m3) | Nickel carbonyl | https://referencesource.org/workplace-exposure-limits/nickel-carbonyl/ | [
"cas_number",
"rel_mgm3",
"rel_ppm",
"substance"
] | null | 0.007 | TWA 0.001 | null | null | null | null |
null | null | null | nickel-insoluble-compounds-as-ni | 0.1 | null | https://www.dir.ca.gov/title8/5155.html | Nickel, insoluble compounds, as Ni | -- | 0.1 | Nickel, insoluble compounds, as Ni | https://referencesource.org/workplace-exposure-limits/nickel-insoluble-compounds-as-ni/ | [
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
null | 7440-02-0 | null | nickel-metal-and-insoluble-compounds-as-ni | 1 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Nickel, metal and insoluble compounds (as Ni) | 7440-02-0 | - | 1 | - | | Nickel, metal and insoluble compounds (as Ni) | https://referencesource.org/workplace-exposure-limits/nickel-metal-and-insoluble-compounds-as-ni/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
null | 7440-02-0 (Metal) | null | nickel-metal-and-other-compounds-as-ni | null | null | https://www.cdc.gov/niosh/npg/npgd0445.html | NIOSH REL Ca TWA 0.015 mg/m3 | Nickel metal and other compounds (as Ni) | https://referencesource.org/workplace-exposure-limits/nickel-metal-and-other-compounds-as-ni/ | [
"cas_number",
"rel_mgm3",
"substance"
] | null | TWA 0.015 | null | null | null | null | null |
null | 7440020 | null | nickel-metal-as-ni | 0.5 | null | https://www.dir.ca.gov/title8/5155.html | 7440020 | | Nickel metal, as Ni | -- | 0.5 | Nickel metal, as Ni | https://referencesource.org/workplace-exposure-limits/nickel-metal-as-ni/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
null | 7440-02-0 | [
{
"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": "Nickel, soluble compounds (as Ni) | 7440-02-0 | - | 1 | - |",
"value": "1"
},
... | nickel-soluble-compounds-as-ni | 1 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Nickel, soluble compounds (as Ni) | 7440-02-0 | - | 1 | - | | Nickel, soluble compounds (as Ni) | https://referencesource.org/workplace-exposure-limits/nickel-soluble-compounds-as-ni/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
null | 12035722 | null | nickel-subsulfide | .05 | null | https://www.dir.ca.gov/title8/5155.html | 12035722 | | Nickel subsulfide | -- | .05 | Nickel subsulfide | https://referencesource.org/workplace-exposure-limits/nickel-subsulfide/ | [
"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.dir.ca.gov/title8/5155.html",
"source_quote": "54115 | S | Nicotine; 1-methyl-2-(3-pyridyl)-pyrrolidine | 0.075 | 0.5",
"value": "0.075"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source"... | 54-11-5 | [] | nicotine | 0.5 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Nicotine | 54-11-5 | - | 0.5 | X | | Nicotine | https://referencesource.org/workplace-exposure-limits/nicotine/ | [
"cas_number",
"pel_mgm3",
"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": "7697372 | | Nitric acid | 2 | 5 | | 4 | 10",
"value": "4"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "stel_mgm3",
"source": "https://www.dir.ca.gov/titl... | 7697-37-2 | [] | nitric-acid | 5 | 2 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Nitric acid | 7697-37-2 | 2 | 5 | - | | Nitric acid | https://referencesource.org/workplace-exposure-limits/nitric-acid/ | [
"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/npgd0448.html",
"source_quote": "NIOSH REL TWA 25 ppm (30 mg/m3)",
"value": "TWA 25"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/n... | 10102-43-9 | [] | nitric-oxide | 30 | 25 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Nitric oxide | 10102-43-9 | 25 | 30 | - | | Nitric oxide | https://referencesource.org/workplace-exposure-limits/nitric-oxide/ | [
"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/npgd0450.html",
"source_quote": "NIOSH REL TWA 1 ppm (5 mg/m3) [skin]",
"value": "TWA 1"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/n... | 98-95-3 | [] | nitrobenzene | 5 | 1 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Nitrobenzene | 98-95-3 | 1 | 5 | X | | Nitrobenzene | https://referencesource.org/workplace-exposure-limits/nitrobenzene/ | [
"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/npgd0453.html",
"source_quote": "NIOSH REL TWA 100 ppm (310 mg/m3)",
"value": "TWA 100"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/np... | 79-24-3 | [] | nitroethane | 310 | 100 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Nitroethane | 79-24-3 | 100 | 310 | - | | Nitroethane | https://referencesource.org/workplace-exposure-limits/nitroethane/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
null | 7727379 | null | nitrogen | null | null | https://www.dir.ca.gov/title8/5155.html | 7727379 | | Nitrogen | (h) | -- | Nitrogen | https://referencesource.org/workplace-exposure-limits/nitrogen/ | [
"cas_number",
"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": "10102440 | | Nitrogen dioxide | | | | 1 | 1.8",
"value": "1"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "stel_mgm3",
"source": "https://www.dir.ca.gov/t... | 10102-44-0 | [] | nitrogen-dioxide | (C)9 | (C)5 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Nitrogen dioxide | 10102-44-0 | (C)5 | (C)9 | - | | Nitrogen dioxide | https://referencesource.org/workplace-exposure-limits/nitrogen-dioxide/ | [
"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/npgd0455.html",
"source_quote": "NIOSH REL TWA 10 ppm (29 mg/m3)",
"value": "TWA 10"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/n... | 7783-54-2 | [] | nitrogen-trifluoride | 29 | 10 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Nitrogen trifluoride | 7783-54-2 | 10 | 29 | - | | Nitrogen trifluoride | https://referencesource.org/workplace-exposure-limits/nitrogen-trifluoride/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
[
{
"as_of": "2026-08-05T00:00:00",
"field": "stel_mgm3",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "55630 | S | Nitroglycerin | | (k) | | -- | 0.1",
"value": "0.1"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/n... | 55-63-0 | [] | nitroglycerin | (C)2 | (C)0.2 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Nitroglycerin | 55-63-0 | (C)0.2 | (C)2 | X | | Nitroglycerin | https://referencesource.org/workplace-exposure-limits/nitroglycerin/ | [
"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/npgd0457.html",
"source_quote": "NIOSH REL See Appendix D",
"value": "See Appendix D"
}
] | 75-52-5 | [
{
"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": "Nitromethane | 75-52-5 | 100 | 250 | - |",
"value": "100"
},
{
"as_of"... | nitromethane | 250 | 100 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Nitromethane | 75-52-5 | 100 | 250 | - | | Nitromethane | https://referencesource.org/workplace-exposure-limits/nitromethane/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
null | 1321126, 99081, 88722, 99990 | null | nitrotoluene | 11 | 2 | https://www.dir.ca.gov/title8/5155.html | 1321126, 99081, 88722, 99990 | S | Nitrotoluene | 2 | 11 | Nitrotoluene | https://referencesource.org/workplace-exposure-limits/nitrotoluene/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
null | 0024972 | null | nitrous-oxide | 90 | 50 | https://www.dir.ca.gov/title8/5155.html | 0024972 | | Nitrous oxide | 50 | 90 | Nitrous oxide | https://referencesource.org/workplace-exposure-limits/nitrous-oxide/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
null | 10024-97-2 | null | nitrous-oxide-2 | null | null | https://www.cdc.gov/niosh/npg/npgd0465.html | NIOSH REL TWA 25 ppm (46 mg/m3) (TWA over the time exposed) | Nitrous oxide | https://referencesource.org/workplace-exposure-limits/nitrous-oxide-2/ | [
"cas_number",
"rel_mgm3",
"rel_ppm",
"substance"
] | null | 46 | TWA 25 | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0466.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... | 111842 | [] | nonane | 1,050 | 200 | https://www.dir.ca.gov/title8/5155.html | 111842 | | Nonane | 200 | 1,050 | Nonane | https://referencesource.org/workplace-exposure-limits/nonane/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
null | null | null | nuisance-particulates-see-particulates-not-otherwise-regulated-total-dust | 10 | null | https://www.dir.ca.gov/title8/5155.html | Nuisance particulates, see Particulates not otherwise regulated Total dust | -- | 10 | Nuisance particulates, see Particulates not otherwise regulated Total dust | https://referencesource.org/workplace-exposure-limits/nuisance-particulates-see-particulates-not-otherwise-regulated-total-dust/ | [
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
null | 90-04-0 | null | o-anisidine | null | null | https://www.cdc.gov/niosh/npg/npgd0034.html | NIOSH REL Ca TWA 0.5 mg/m3 [skin] | o-Anisidine | https://referencesource.org/workplace-exposure-limits/o-anisidine/ | [
"cas_number",
"rel_mgm3",
"substance"
] | null | TWA 0.5 | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0122.html",
"source_quote": "NIOSH REL C 0.05 ppm (0.4 mg/m3) [skin]",
"value": "C 0.05"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/nio... | 2698-41-1 | [] | o-chlorobenzylidene-malononitrile | 0.4 | 0.05 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | o-Chlorobenzylidene malononitrile | 2698-41-1 | 0.05 | 0.4 | - | | o-Chlorobenzylidene malononitrile | https://referencesource.org/workplace-exposure-limits/o-chlorobenzylidene-malononitrile/ | [
"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/npgd0134.html",
"source_quote": "NIOSH REL TWA 50 ppm (285 mg/m3) ST 75 ppm (428 mg/m3)",
"value": "TWA 50"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://... | 2039874 | [] | o-chlorostyrene | 285 | 50 | https://www.dir.ca.gov/title8/5155.html | 2039874 | | o-Chlorostyrene | 50 | 285 | | 75 | 428 | o-Chlorostyrene | https://referencesource.org/workplace-exposure-limits/o-chlorostyrene/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"stel_mgm3",
"stel_ppm",
"substance"
] | null | null | null | null | 428 | 75 | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0135.html",
"source_quote": "NIOSH REL TWA 50 ppm (250 mg/m3) ST 75 ppm (375 mg/m3)",
"value": "TWA 50"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://... | 95498 | [] | o-chlorotoluene | 250 | 50 | https://www.dir.ca.gov/title8/5155.html | 95498 | S | o-Chlorotoluene | 50 | 250 | o-Chlorotoluene | https://referencesource.org/workplace-exposure-limits/o-chlorotoluene/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
null | 95-48-7 | null | o-cresol | null | null | https://www.cdc.gov/niosh/npg/npgd0154.html | NIOSH REL TWA 2.3 ppm (10 mg/m3) | o-Cresol | https://referencesource.org/workplace-exposure-limits/o-cresol/ | [
"cas_number",
"rel_mgm3",
"rel_ppm",
"substance"
] | null | 10 | TWA 2.3 | null | null | null | null |
null | 119-90-4 | null | o-dianisidine | null | null | https://www.cdc.gov/niosh/npg/npgd0180.html | NIOSH REL Ca See Appendix A See Appendix C | o-Dianisidine | https://referencesource.org/workplace-exposure-limits/o-dianisidine/ | [
"cas_number",
"rel_statement",
"substance"
] | Ca See Appendix A See Appendix C | 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": "95501 | S | o-Dichlorobenzene | 25 | 150 | 50 ppm",
"value": "50 ppm"
},
{
"as_of": "2026-09-28T00:00:00",
"field": "ceiling_notation",
"source": "https://w... | 95-50-1 | [
{
"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": "o-Dichlorobenzene | 95-50-1 | (C)50 | (C)300 | - |",
"value": "(C)50"
},
{
... | o-dichlorobenzene | (C)300 | (C)50 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | o-Dichlorobenzene | 95-50-1 | (C)50 | (C)300 | - | | o-Dichlorobenzene | https://referencesource.org/workplace-exposure-limits/o-dichlorobenzene/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
null | 528-29-0 | [] | o-dinitrobenzene | null | null | https://www.cdc.gov/niosh/npg/npgd0231.html | NIOSH REL TWA 1 mg/m3 [skin] | o-Dinitrobenzene | https://referencesource.org/workplace-exposure-limits/o-dinitrobenzene/ | [
"cas_number",
"rel_mgm3",
"substance"
] | null | TWA 1 | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0462.html",
"source_quote": "NIOSH REL TWA 2 ppm (11 mg/m3) [skin]",
"value": "TWA 2"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/... | 88-72-2 | [] | o-isomer | null | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | o-isomer | 88-72-2 | - | - | - | | o-isomer | https://referencesource.org/workplace-exposure-limits/o-isomer/ | [
"cas_number",
"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": "583608 | S | o-Methylcyclohexanone | 50 | 230 | | 75 | 345",
"value": "75"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "stel_mgm3",
"source": "https://ww... | 583-60-8 | [
{
"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": "o-Methylcyclohexanone | 583-60-8 | 100 | 460 | X |",
"value": "100"
},
{
... | o-methylcyclohexanone | 460 | 100 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | o-Methylcyclohexanone | 583-60-8 | 100 | 460 | X | | o-Methylcyclohexanone | https://referencesource.org/workplace-exposure-limits/o-methylcyclohexanone/ | [
"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/npgd0084.html",
"source_quote": "NIOSH REL TWA 5 ppm (30 mg/m3) [skin]",
"value": "TWA 5"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/... | 89725 | [] | o-sec-butylphenol | 30 | 5 | https://www.dir.ca.gov/title8/5155.html | 89725 | S | o-sec-Butylphenol | 5 | 30 | o-sec-Butylphenol | https://referencesource.org/workplace-exposure-limits/o-sec-butylphenol/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
null | 84-15-1 | null | o-terphenyl | null | null | https://www.cdc.gov/niosh/npg/npgd0591.html | NIOSH REL C 5 mg/m3 (0.5 ppm) | o-Terphenyl | https://referencesource.org/workplace-exposure-limits/o-terphenyl/ | [
"cas_number",
"rel_mgm3",
"rel_ppm",
"substance"
] | null | C 5 | 0.5 | null | null | null | null |
null | 119-93-7 | null | o-tolidine | null | null | https://www.cdc.gov/niosh/npg/npgd0618.html | NIOSH REL Ca C 0.02 mg/m3 [60-minute] [skin] | o-Tolidine | https://referencesource.org/workplace-exposure-limits/o-tolidine/ | [
"cas_number",
"rel_mgm3",
"substance"
] | null | C 0.02 | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_statement",
"source": "https://www.cdc.gov/niosh/npg/npgd0622.html",
"source_quote": "NIOSH REL Ca [skin] See Appendix A",
"value": "Ca [skin] See Appendix A"
}
] | 95-53-4 | [
{
"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": "o-Toluidine | 95-53-4 | 5 | 22 | X |",
"value": "5"
},
{
"as_of": "202... | o-toluidine | 22 | 5 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | o-Toluidine | 95-53-4 | 5 | 22 | X | | o-Toluidine | https://referencesource.org/workplace-exposure-limits/o-toluidine/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
null | 95-47-6 | null | o-xylene | null | null | https://www.cdc.gov/niosh/npg/npgd0668.html | NIOSH REL TWA 100 ppm (435 mg/m3) ST 150 ppm (655 mg/m3) | o-Xylene | https://referencesource.org/workplace-exposure-limits/o-xylene/ | [
"cas_number",
"rel_mgm3",
"rel_ppm",
"substance"
] | null | 435 | TWA 100 | null | null | null | null |
[
{
"as_of": "2026-08-05T00:00:00",
"field": "stel_mgm3",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "2234131 | S | Octachloronaphthalene | -- | 0.1 | | -- | 0.3",
"value": "0.3"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://... | 2234-13-1 | [] | octachloronaphthalene | 0.1 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Octachloronaphthalene | 2234-13-1 | - | 0.1 | X | | Octachloronaphthalene | https://referencesource.org/workplace-exposure-limits/octachloronaphthalene/ | [
"cas_number",
"pel_mgm3",
"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": "111659 | | Octane | 300 | 1,450 | | 375 | 1800",
"value": "375"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "stel_mgm3",
"source": "https://www.dir.ca.go... | 111-65-9 | [
{
"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": "Octane | 111-65-9 | 500 | 2350 | - |",
"value": "500"
},
{
"as_of": "2... | octane | 2350 | 500 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Octane | 111-65-9 | 500 | 2350 | - | | Octane | https://referencesource.org/workplace-exposure-limits/octane/ | [
"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/npgd0472.html",
"source_quote": "NIOSH REL TWA 5 mg/m3 ST 10 mg/m3",
"value": "TWA 5"
}
] | 8012951 | [
{
"field": "pel_mgm3",
"versions": [
{
"as_of": "2026-08-05T00:00:00",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "8012951 | | Oil (mineral) mist, particulate | -- | (5)(l)",
"value": "(5)(l)"
},
{
"as_of": "2026-08-05T00:00... | oil-mineral-mist-particulate | (5)(l) | null | https://www.dir.ca.gov/title8/5155.html | 8012951 | | Oil (mineral) mist, particulate | -- | (5)(l) | Oil (mineral) mist, particulate | https://referencesource.org/workplace-exposure-limits/oil-mineral-mist-particulate/ | [
"cas_number",
"pel_mgm3",
"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": "Osmium tetroxide (as Os) | 20816-12-0 | - | 0.002 | - |",
"value": "0.002"
},
{
"as_of": "2026-08-05T00:00:00",
"field"... | 20816-12-0 | [] | osmium-tetroxide | null | null | https://www.cdc.gov/niosh/npg/npgd0473.html | NIOSH REL TWA 0.002 mg/m3 (0.0002 ppm) ST 0.006 mg/m3 (0.0006 ppm) | Osmium tetroxide | https://referencesource.org/workplace-exposure-limits/osmium-tetroxide/ | [
"cas_number",
"rel_mgm3",
"rel_ppm",
"substance"
] | null | TWA 0.002 | 0.0002 | null | null | null | null |
[
{
"as_of": "2026-08-05T00:00:00",
"field": "stel_mgm3",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "144627 | | Oxalic acid | -- | 1 | | -- | 2",
"value": "2"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/n... | 144-62-7 | [] | oxalic-acid | 1 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Oxalic acid | 144-62-7 | - | 1 | - | | Oxalic acid | https://referencesource.org/workplace-exposure-limits/oxalic-acid/ | [
"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": "7783417 | | Oxygen difluoride | 0.05 | 0.1 | C",
"value": "the values given in the PEL columns are ceiling values"
},
{
"as_of": "2026-09-08T00:00:00",
... | 7783-41-7 | [] | oxygen-difluoride | 0.1 | 0.05 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Oxygen difluoride | 7783-41-7 | 0.05 | 0.1 | - | | Oxygen difluoride | https://referencesource.org/workplace-exposure-limits/oxygen-difluoride/ | [
"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": "10028156 | | Ozone | 0.1 | 0.2 | | 0.3 | 0.6",
"value": "0.3"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "stel_mgm3",
"source": "https://www.dir.ca.gov/... | 10028-15-6 | [] | ozone | 0.2 | 0.1 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Ozone | 10028-15-6 | 0.1 | 0.2 | - | | Ozone | https://referencesource.org/workplace-exposure-limits/ozone/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
null | 104-94-9 | null | p-anisidine | null | null | https://www.cdc.gov/niosh/npg/npgd0035.html | NIOSH REL TWA 0.5 mg/m3 [skin] | p-Anisidine | https://referencesource.org/workplace-exposure-limits/p-anisidine/ | [
"cas_number",
"rel_mgm3",
"substance"
] | null | TWA 0.5 | null | null | null | null | null |
null | 106-44-5 | null | p-cresol | null | null | https://www.cdc.gov/niosh/npg/npgd0156.html | NIOSH REL TWA 2.3 ppm (10 mg/m3) | p-Cresol | https://referencesource.org/workplace-exposure-limits/p-cresol/ | [
"cas_number",
"rel_mgm3",
"rel_ppm",
"substance"
] | null | 10 | TWA 2.3 | null | null | null | null |
[
{
"as_of": "2026-09-28T00:00:00",
"field": "ceiling",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "106467 | | p-Dichlorobenzene; 1,4-dichlorobenzene | 10 | 60 | 200 ppm | 110 | 675",
"value": "200 ppm"
},
{
"as_of": "2026-09-28T00:00:00",
"field": "ceiling_no... | 106-46-7 | [
{
"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": "p-Dichlorobenzene | 106-46-7 | 75 | 450 | - |",
"value": "75"
},
{
"as... | p-dichlorobenzene | 450 | 75 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | p-Dichlorobenzene | 106-46-7 | 75 | 450 | - | | p-Dichlorobenzene | https://referencesource.org/workplace-exposure-limits/p-dichlorobenzene/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
null | 100-25-4 | [] | p-dinitrobenzene | null | null | https://www.cdc.gov/niosh/npg/npgd0233.html | NIOSH REL TWA 1 mg/m3 [skin] | p-Dinitrobenzene | https://referencesource.org/workplace-exposure-limits/p-dinitrobenzene/ | [
"cas_number",
"rel_mgm3",
"substance"
] | null | TWA 1 | null | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_ppm",
"source": "https://www.cdc.gov/niosh/npg/npgd0464.html",
"source_quote": "NIOSH REL TWA 2 ppm (11 mg/m3) [skin]",
"value": "TWA 2"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/... | 99-99-0 | [] | p-isomer | null | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | p-isomer | 99-99-0 | - | - | - | | p-isomer | https://referencesource.org/workplace-exposure-limits/p-isomer/ | [
"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/npgd0449.html",
"source_quote": "NIOSH REL TWA 3 mg/m3 [skin]",
"value": "TWA 3"
}
] | 100-01-6 | [
{
"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": "p-Nitroaniline | 100-01-6 | 1 | 6 | X |",
"value": "6"
},
{
"as_of": ... | p-nitroaniline | 6 | 1 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | p-Nitroaniline | 100-01-6 | 1 | 6 | X | | p-Nitroaniline | https://referencesource.org/workplace-exposure-limits/p-nitroaniline/ | [
"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": "100005 | S | p-Nitrochlorobenzene; 1-chloro-4-nitrobenzene | 0.1 | 0.64",
"value": "0.1"
},
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_statement",
"sou... | 100-00-5 | [
{
"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": "p-Nitrochlorobenzene | 100-00-5 | - | 1 | X |",
"value": "1"
},
{
"as... | p-nitrochlorobenzene | 1 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | p-Nitrochlorobenzene | 100-00-5 | - | 1 | X | | p-Nitrochlorobenzene | https://referencesource.org/workplace-exposure-limits/p-nitrochlorobenzene/ | [
"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/npgd0495.html",
"source_quote": "NIOSH REL TWA 0.1 mg/m3 [skin]",
"value": "TWA 0.1"
}
] | 106-50-3 | [] | p-phenylene-diamine | 0.1 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | p-Phenylene diamine | 106-50-3 | - | 0.1 | X | | p-Phenylene diamine | https://referencesource.org/workplace-exposure-limits/p-phenylene-diamine/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
null | 92-94-4 | null | p-terphenyl | null | null | https://www.cdc.gov/niosh/npg/npgd0593.html | NIOSH REL C 5 mg/m3 (0.5 ppm) | p-Terphenyl | https://referencesource.org/workplace-exposure-limits/p-terphenyl/ | [
"cas_number",
"rel_mgm3",
"rel_ppm",
"substance"
] | null | C 5 | 0.5 | 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": "98511 | | p-tert-Butyltoluene | 1 | 6.1 | | 20 | 120",
"value": "20"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "stel_mgm3",
"source": "https://www.dir.... | 98-51-1 | [
{
"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": "p-tert-Butyltoluene | 98-51-1 | 10 | 60 | - |",
"value": "10"
},
{
"as... | p-tert-butyltoluene | 60 | 10 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | p-tert-Butyltoluene | 98-51-1 | 10 | 60 | - | | p-tert-Butyltoluene | https://referencesource.org/workplace-exposure-limits/p-tert-butyltoluene/ | [
"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/npgd0624.html",
"source_quote": "NIOSH REL Ca See Appendix A",
"value": "Ca See Appendix A"
}
] | 106490 | [] | p-toluidine | 9 | 2 | https://www.dir.ca.gov/title8/5155.html | 106490 | S | p-Toluidine | 2 | 9 | p-Toluidine | https://referencesource.org/workplace-exposure-limits/p-toluidine/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null | null | null | null | null | null |
null | 106-42-3 | null | p-xylene | null | null | https://www.cdc.gov/niosh/npg/npgd0670.html | NIOSH REL TWA 100 ppm (435 mg/m3) ST 150 ppm (655 mg/m3) | p-Xylene | https://referencesource.org/workplace-exposure-limits/p-xylene/ | [
"cas_number",
"rel_mgm3",
"rel_ppm",
"substance"
] | null | 435 | TWA 100 | null | null | null | null |
[
{
"as_of": "2026-09-08T00:00:00",
"field": "rel_mgm3",
"source": "https://www.cdc.gov/niosh/npg/npgd0477.html",
"source_quote": "NIOSH REL TWA 2 mg/m3",
"value": "TWA 2"
}
] | 8002742 | [] | paraffin-wax-fume | 2 | null | https://www.dir.ca.gov/title8/5155.html | 8002742 | | Paraffin wax fume | -- | 2 | Paraffin wax fume | https://referencesource.org/workplace-exposure-limits/paraffin-wax-fume/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
null | 1910-42-5 | null | paraquat-paraquat-dichloride | null | null | https://www.cdc.gov/niosh/npg/npgd0478.html | NIOSH REL TWA 0.1 mg/m3 (resp) [skin] | Paraquat (Paraquat dichloride) | https://referencesource.org/workplace-exposure-limits/paraquat-paraquat-dichloride/ | [
"cas_number",
"rel_statement",
"substance"
] | TWA 0.1 mg/m3 (resp) [skin] | null | null | null | null | null | null |
null | 1910425 | null | paraquat-respirable-sizes | 0.1(n) | null | https://www.dir.ca.gov/title8/5155.html | 1910425, | S | Paraquat, respirable sizes | -- | 0.1(n) | Paraquat, respirable sizes | https://referencesource.org/workplace-exposure-limits/paraquat-respirable-sizes/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
null | 1910425 | null | paraquat-total-particulates | 0.5 | null | https://www.dir.ca.gov/title8/5155.html | 1910425, | S | Paraquat, total particulates | -- | 0.5 | Paraquat, total particulates | https://referencesource.org/workplace-exposure-limits/paraquat-total-particulates/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null | null | null | null | null | null |
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