cas_number stringlengths 5 11 | disagreements listlengths 0 2 ⌀ | id stringlengths 3 80 | pel_mgm3 stringlengths 1 12 ⌀ | pel_ppm stringclasses 52
values | source stringclasses 2
values | source_quote stringlengths 22 164 | stel_mgm3 stringclasses 42
values | stel_ppm stringclasses 24
values | substance stringlengths 3 139 | url stringlengths 58 135 | verified_fields listlengths 2 7 | also_reported listlengths 1 5 ⌀ | ceiling stringclasses 11
values |
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
76-11-9 | [] | 1-1-1-2-tetrachloro-2-2-difluoroethane | 4170 | 500 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | 1,1,1,2-Tetrachloro-2,2-difluoroethane | 76-11-9 | 500 | 4170 | - | | null | null | 1,1,1,2-Tetrachloro-2,2-difluoroethane | https://referencesource.org/workplace-exposure-limits/1-1-1-2-tetrachloro-2-2-difluoroethane/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null |
50293 | null | 1-1-1-trichloro-2-2-bis-p-chlorophenyl-ethane-see-ddt | null | null | https://www.dir.ca.gov/title8/5155.html | 50293 | | 1,1,1,-Trichloro-2,2-bis(p-chlorophenyl)ethane; see DDT | null | null | 1,1,1,-Trichloro-2,2-bis(p-chlorophenyl)ethane; see DDT | https://referencesource.org/workplace-exposure-limits/1-1-1-trichloro-2-2-bis-p-chlorophenyl-ethane-see-ddt/ | [
"cas_number",
"substance"
] | null | null |
71556 | null | 1-1-1-trichloroethane-see-methyl-chloroform | null | null | https://www.dir.ca.gov/title8/5155.html | 71556 | | 1,1,1-Trichloroethane; see Methyl chloroform | null | null | 1,1,1-Trichloroethane; see Methyl chloroform | https://referencesource.org/workplace-exposure-limits/1-1-1-trichloroethane-see-methyl-chloroform/ | [
"cas_number",
"substance"
] | null | null |
79276 | null | 1-1-2-2-tetrabromoethane-see-acetylene-tetrabromide | null | null | https://www.dir.ca.gov/title8/5155.html | 79276 | | 1,1,2,2-Tetrabromoethane; see Acetylene tetrabromide | null | null | 1,1,2,2-Tetrabromoethane; see Acetylene tetrabromide | https://referencesource.org/workplace-exposure-limits/1-1-2-2-tetrabromoethane-see-acetylene-tetrabromide/ | [
"cas_number",
"substance"
] | null | null |
76-12-0 | null | 1-1-2-2-tetrachloro-1-2-difluoroethane | 4170 | 500 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | 1,1,2,2-Tetrachloro-1,2-difluoroethane | 76-12-0 | 500 | 4170 | - | | null | null | 1,1,2,2-Tetrachloro-1,2-difluoroethane | https://referencesource.org/workplace-exposure-limits/1-1-2-2-tetrachloro-1-2-difluoroethane/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null |
76120 | null | 1-1-2-2-tetrachloro-1-2-difluoroethane-fluorocarbon-112 | 4,170 | 500 | https://www.dir.ca.gov/title8/5155.html | 76120 | | 1,1,2,2-Tetrachloro-1,2-difluoroethane; fluorocarbon 112 | 500 | 4,170 | null | null | 1,1,2,2-Tetrachloro-1,2-difluoroethane; fluorocarbon 112 | https://referencesource.org/workplace-exposure-limits/1-1-2-2-tetrachloro-1-2-difluoroethane-fluorocarbon-112/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null |
79-34-5 | null | 1-1-2-2-tetrachloroethane | 35 | 5 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | 1,1,2,2-Tetrachloroethane | 79-34-5 | 5 | 35 | X | | null | null | 1,1,2,2-Tetrachloroethane | https://referencesource.org/workplace-exposure-limits/1-1-2-2-tetrachloroethane/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null |
79345 | null | 1-1-2-2-tetrachloroethane-acetylene-tetrachloride | 7 | 1 | https://www.dir.ca.gov/title8/5155.html | 79345 | S | 1,1,2,2-Tetrachloroethane; acetylene tetrachloride | 1 | 7 | null | null | 1,1,2,2-Tetrachloroethane; acetylene tetrachloride | https://referencesource.org/workplace-exposure-limits/1-1-2-2-tetrachloroethane-acetylene-tetrachloride/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null |
76-13-1 | [] | 1-1-2-trichloro-1-2-2-trifluoroethane | 7600 | 1000 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | 1,1,2-Trichloro-1,2,2-trifluoroethane | 76-13-1 | 1000 | 7600 | - | | null | null | 1,1,2-Trichloro-1,2,2-trifluoroethane | https://referencesource.org/workplace-exposure-limits/1-1-2-trichloro-1-2-2-trifluoroethane/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | [
{
"as_of": "2026-08-05T00:00:00",
"field": "ceiling",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "76131 | | 1,1,2-Trichloro-1,2,2-trifluoroethane | 1000 | 7600 | 2000 ppm | 1250 | 9500",
"value": "2000 ppm"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "stel... | null |
79-00-5 | [] | 1-1-2-trichloroethane | 45 | 10 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | 1,1,2-Trichloroethane | 79-00-5 | 10 | 45 | X | | null | null | 1,1,2-Trichloroethane | https://referencesource.org/workplace-exposure-limits/1-1-2-trichloroethane/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null |
594-72-9 | [
{
"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": "1,1-Dichloro-1-nitroethane | 594-72-9 | (C)10 | (C)60 | - |",
"value": "(C)10"
},
... | 1-1-dichloro-1-nitroethane | (C)60 | (C)10 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | 1,1-Dichloro-1-nitroethane | 594-72-9 | (C)10 | (C)60 | - | | null | null | 1,1-Dichloro-1-nitroethane | https://referencesource.org/workplace-exposure-limits/1-1-dichloro-1-nitroethane/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null |
75-34-3 | [] | 1-1-dichloroethane | 400 | 100 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | 1,1-Dichloroethane | 75-34-3 | 100 | 400 | - | | null | null | 1,1-Dichloroethane | https://referencesource.org/workplace-exposure-limits/1-1-dichloroethane/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null |
75354 | null | 1-1-dichloroethylene-see-vinylidene-chloride | null | null | https://www.dir.ca.gov/title8/5155.html | 75354 | | 1,1-Dichloroethylene; see Vinylidene chloride | null | null | 1,1-Dichloroethylene; see Vinylidene chloride | https://referencesource.org/workplace-exposure-limits/1-1-dichloroethylene-see-vinylidene-chloride/ | [
"cas_number",
"substance"
] | null | null |
57-14-7 | [
{
"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": "1,1-Dimethylhydrazine | 57-14-7 | 0.5 | 1 | X |",
"value": "0.5"
},
{
... | 1-1-dimethylhydrazine | 1 | 0.5 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | 1,1-Dimethylhydrazine | 57-14-7 | 0.5 | 1 | X | | null | null | 1,1-Dimethylhydrazine | https://referencesource.org/workplace-exposure-limits/1-1-dimethylhydrazine/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null |
96-18-4 | [
{
"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": "1,2,3-Trichloropropane | 96-18-4 | 50 | 300 | - |",
"value": "50"
},
{
... | 1-2-3-trichloropropane | 300 | 50 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | 1,2,3-Trichloropropane | 96-18-4 | 50 | 300 | - | | null | null | 1,2,3-Trichloropropane | https://referencesource.org/workplace-exposure-limits/1-2-3-trichloropropane/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null |
120821 | null | 1-2-4-trichlorobenzene | 40 | 5 | https://www.dir.ca.gov/title8/5155.html | 120821 | | 1,2,4-Trichlorobenzene | 5 | 40 | C | null | null | 1,2,4-Trichlorobenzene | https://referencesource.org/workplace-exposure-limits/1-2-4-trichlorobenzene/ | [
"cas_number",
"ceiling",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | C |
107153 | null | 1-2-diaminoethane-see-ethylenediamine-diatomacous-earth-see-silica-amorphous | null | null | https://www.dir.ca.gov/title8/5155.html | 107153 | | 1,2-Diaminoethane; see Ethylenediamine Diatomacous earth; see Silica-amorphous | null | null | 1,2-Diaminoethane; see Ethylenediamine Diatomacous earth; see Silica-amorphous | https://referencesource.org/workplace-exposure-limits/1-2-diaminoethane-see-ethylenediamine-diatomacous-earth-see-silica-amorphous/ | [
"cas_number",
"substance"
] | null | null |
96-12-8 | [] | 1-2-dibromo-3-chloropropane-dbcp-see-1910-1044 | null | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | 1,2-Dibromo-3-chloropropane (DBCP); see 1910.1044 | 96-12-8 | - | - | - | | null | null | 1,2-Dibromo-3-chloropropane (DBCP); see 1910.1044 | https://referencesource.org/workplace-exposure-limits/1-2-dibromo-3-chloropropane-dbcp-see-1910-1044/ | [
"cas_number",
"substance"
] | [
{
"as_of": "2026-08-05T00:00:00",
"field": "pel_ppm",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "96128 | | 1,2-Dibromo-3-chloropropane; DBCP; see Section 5212 | .001 | .01",
"value": ".001"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "pel_mgm3",
"sour... | null |
106934 | null | 1-2-dibromoethane-see-ethylene-dibromide-section-5219 | null | null | https://www.dir.ca.gov/title8/5155.html | 106934 | S | 1,2-Dibromoethane; see Ethylene dibromide, Section 5219 | null | null | 1,2-Dibromoethane; see Ethylene dibromide, Section 5219 | https://referencesource.org/workplace-exposure-limits/1-2-dibromoethane-see-ethylene-dibromide-section-5219/ | [
"cas_number",
"substance"
] | null | null |
107062 | null | 1-2-dichloroethane-see-ethylene-dichloride | null | null | https://www.dir.ca.gov/title8/5155.html | 107062 | | 1,2-Dichloroethane, see Ethylene dichloride | null | null | 1,2-Dichloroethane, see Ethylene dichloride | https://referencesource.org/workplace-exposure-limits/1-2-dichloroethane-see-ethylene-dichloride/ | [
"cas_number",
"substance"
] | null | null |
540-59-0 | null | 1-2-dichloroethylene | 790 | 200 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | 1,2-Dichloroethylene | 540-59-0 | 200 | 790 | - | | null | null | 1,2-Dichloroethylene | https://referencesource.org/workplace-exposure-limits/1-2-dichloroethylene/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null |
540590 | null | 1-2-dichloroethylene-acetylene-dichloride | 790 | 200 | https://www.dir.ca.gov/title8/5155.html | 540590 | | 1,2-Dichloroethylene; acetylene dichloride | 200 | 790 | null | null | 1,2-Dichloroethylene; acetylene dichloride | https://referencesource.org/workplace-exposure-limits/1-2-dichloroethylene-acetylene-dichloride/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null |
78875 | null | 1-2-dichloropropane-see-propylene-dichloride | null | null | https://www.dir.ca.gov/title8/5155.html | 78875 | | 1,2-Dichloropropane; see Propylene dichloride | null | null | 1,2-Dichloropropane; see Propylene dichloride | https://referencesource.org/workplace-exposure-limits/1-2-dichloropropane-see-propylene-dichloride/ | [
"cas_number",
"substance"
] | null | null |
76142 | [
{
"field": "pel_ppm",
"versions": [
{
"as_of": "2026-08-05T00:00:00",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "76142 | | 1,2-Dichlorotetrafluoroethane; Fluorocarbon 114 | 1,000 | 7,000",
"value": "1,000"
},
{
"as_of": "20... | 1-2-dichlorotetrafluoroethane-fluorocarbon-114 | 7,000 | 1,000 | https://www.dir.ca.gov/title8/5155.html | 76142 | | 1,2-Dichlorotetrafluoroethane; Fluorocarbon 114 | 1,000 | 7,000 | null | null | 1,2-Dichlorotetrafluoroethane; Fluorocarbon 114 | https://referencesource.org/workplace-exposure-limits/1-2-dichlorotetrafluoroethane-fluorocarbon-114/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null |
75569 | null | 1-2-epoxypropane-see-propylene-oxide | null | null | https://www.dir.ca.gov/title8/5155.html | 75569 | | 1,2-Epoxypropane; see Propylene oxide | null | null | 1,2-Epoxypropane; see Propylene oxide | https://referencesource.org/workplace-exposure-limits/1-2-epoxypropane-see-propylene-oxide/ | [
"cas_number",
"substance"
] | null | null |
2451629 | null | 1-3-5-triglycidyl-s-triazinetrione | 0.005 | null | https://www.dir.ca.gov/title8/5155.html | 2451629 | | 1,3,5-Triglycidyl-s-triazinetrione | | 0.005 | null | null | 1,3,5-Triglycidyl-s-triazinetrione | https://referencesource.org/workplace-exposure-limits/1-3-5-triglycidyl-s-triazinetrione/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null |
106990 | [
{
"field": "pel_ppm",
"versions": [
{
"as_of": "2026-08-05T00:00:00",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "106990 | | 1,3-Butadiene (see also section 5201) | 1 | 2.2 | | 5 | 11",
"value": "1"
},
{
"as_of": "2026-08-05... | 1-3-butadiene-see-also-section-5201 | 2.2 | 1 | https://www.dir.ca.gov/title8/5155.html | 106990 | | 1,3-Butadiene (see also section 5201) | 1 | 2.2 | | 5 | 11 | 11 | 5 | 1,3-Butadiene (see also section 5201) | https://referencesource.org/workplace-exposure-limits/1-3-butadiene-see-also-section-5201/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"stel_mgm3",
"stel_ppm",
"substance"
] | null | null |
118-52-5 | [] | 1-3-dichloro-5-5-dimethyl-hydantoin | 0.2 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | 1,3-Dichloro-5,5-dimethyl hydantoin | 118-52-5 | - | 0.2 | - | | null | null | 1,3-Dichloro-5,5-dimethyl hydantoin | https://referencesource.org/workplace-exposure-limits/1-3-dichloro-5-5-dimethyl-hydantoin/ | [
"cas_number",
"pel_mgm3",
"substance"
] | [
{
"as_of": "2026-08-05T00:00:00",
"field": "stel_mgm3",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "118525 | | 1,3-Dichloro-5,5-dimethyl hydantoin | -- | 0.2 | | -- | 0.4",
"value": "0.4"
}
] | null |
108849 | null | 1-3-dimethylbutyl-acetate-see-sec-hexyl-acetate | null | null | https://www.dir.ca.gov/title8/5155.html | 108849 | | 1,3-Dimethylbutyl acetate; see sec-Hexyl acetate | null | null | 1,3-Dimethylbutyl acetate; see sec-Hexyl acetate | https://referencesource.org/workplace-exposure-limits/1-3-dimethylbutyl-acetate-see-sec-hexyl-acetate/ | [
"cas_number",
"substance"
] | null | null |
764410 | null | 1-4-dichloro-2-butene | 0.025 | 0.005 | https://www.dir.ca.gov/title8/5155.html | 764410 | S | 1,4-Dichloro-2-butene | 0.005 | 0.025 | null | null | 1,4-Dichloro-2-butene | https://referencesource.org/workplace-exposure-limits/1-4-dichloro-2-butene/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null |
123911 | null | 1-4-diethylene-dioxide-see-p-dioxane | null | null | https://www.dir.ca.gov/title8/5155.html | 123911 | | 1,4-Diethylene dioxide; see p-Dioxane | null | null | 1,4-Diethylene dioxide; see p-Dioxane | https://referencesource.org/workplace-exposure-limits/1-4-diethylene-dioxide-see-p-dioxane/ | [
"cas_number",
"substance"
] | null | null |
124094 | null | 1-6-hexanediamine | 2.3 | 0.5 | https://www.dir.ca.gov/title8/5155.html | 124094 | | 1,6-Hexanediamine | 0.5 | 2.3 | null | null | 1,6-Hexanediamine | https://referencesource.org/workplace-exposure-limits/1-6-hexanediamine/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null |
106945 | null | 1-bromopropane-n-propyl-bromide | 25 | 5 | https://www.dir.ca.gov/title8/5155.html | 106945 | S | 1-bromopropane, n-propyl bromide | 5 | 25 | null | null | 1-bromopropane, n-propyl bromide | https://referencesource.org/workplace-exposure-limits/1-bromopropane-n-propyl-bromide/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null |
109795 | null | 1-butanethiol-see-butyl-mercaptan | null | null | https://www.dir.ca.gov/title8/5155.html | 109795 | | 1-Butanethiol; see Butyl mercaptan | null | null | 1-Butanethiol; see Butyl mercaptan | https://referencesource.org/workplace-exposure-limits/1-butanethiol-see-butyl-mercaptan/ | [
"cas_number",
"substance"
] | null | null |
71363 | null | 1-butanol-see-n-butyl-alcohol | null | null | https://www.dir.ca.gov/title8/5155.html | 71363 | | 1-Butanol; see n-Butyl alcohol | null | null | 1-Butanol; see n-Butyl alcohol | https://referencesource.org/workplace-exposure-limits/1-butanol-see-n-butyl-alcohol/ | [
"cas_number",
"substance"
] | null | null |
600-25-9 | [
{
"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": "1-Chloro-1-nitropropane | 600-25-9 | 20 | 100 | - |",
"value": "20"
},
{
... | 1-chloro-1-nitropropane | 100 | 20 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | 1-Chloro-1-nitropropane | 600-25-9 | 20 | 100 | - | | null | null | 1-Chloro-1-nitropropane | https://referencesource.org/workplace-exposure-limits/1-chloro-1-nitropropane/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null |
106898 | null | 1-chloro-2-3-epoxypropane-see-epichlorohydrin | null | null | https://www.dir.ca.gov/title8/5155.html | 106898 | | 1-Chloro-2,3-epoxypropane; see Epichlorohydrin | null | null | 1-Chloro-2,3-epoxypropane; see Epichlorohydrin | https://referencesource.org/workplace-exposure-limits/1-chloro-2-3-epoxypropane-see-epichlorohydrin/ | [
"cas_number",
"substance"
] | null | null |
100005 | null | 1-chloro-4-nitrobenzene-see-p-nitrochlorobenzene | null | null | https://www.dir.ca.gov/title8/5155.html | 100005 | | 1-Chloro-4-nitrobenzene; see p-Nitrochlorobenzene | null | null | 1-Chloro-4-nitrobenzene; see p-Nitrochlorobenzene | https://referencesource.org/workplace-exposure-limits/1-chloro-4-nitrobenzene-see-p-nitrochlorobenzene/ | [
"cas_number",
"substance"
] | null | null |
592416 | null | 1-hexene | 180 | 50 | https://www.dir.ca.gov/title8/5155.html | 592416 | | 1-Hexene | 50 | 180 | null | null | 1-Hexene | https://referencesource.org/workplace-exposure-limits/1-hexene/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null |
63252 | null | 1-naphthyl-n-methylcarbamate-see-carbaryl | null | null | https://www.dir.ca.gov/title8/5155.html | 63252 | | 1-Naphthyl N-methylcarbamate; see Carbaryl | null | null | 1-Naphthyl N-methylcarbamate; see Carbaryl | https://referencesource.org/workplace-exposure-limits/1-naphthyl-n-methylcarbamate-see-carbaryl/ | [
"cas_number",
"substance"
] | null | null |
108-03-2 | [] | 1-nitropropane | 90 | 25 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | 1-Nitropropane | 108-03-2 | 25 | 90 | - | | null | null | 1-Nitropropane | https://referencesource.org/workplace-exposure-limits/1-nitropropane/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null |
3333526 | null | 2-2-azobisisobutyronitrile-decomposition-product-see-tetramethyl-succinonitrile | null | null | https://www.dir.ca.gov/title8/5155.html | 3333526 | S | 2,2′-Azobisisobutyronitrile decomposition product, see Tetramethyl succinonitrile | null | null | 2,2′-Azobisisobutyronitrile decomposition product, see Tetramethyl succinonitrile | https://referencesource.org/workplace-exposure-limits/2-2-azobisisobutyronitrile-decomposition-product-see-tetramethyl-succinonitrile/ | [
"cas_number",
"substance"
] | null | null |
75990 | null | 2-2-dichloropropionic-acid | 6 | 1 | https://www.dir.ca.gov/title8/5155.html | 75990 | | 2,2-Dichloropropionic acid | 1 | 6 | null | null | 2,2-Dichloropropionic acid | https://referencesource.org/workplace-exposure-limits/2-2-dichloropropionic-acid/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null |
556525 | null | 2-3-epoxypropanol-see-glycidol | null | null | https://www.dir.ca.gov/title8/5155.html | 556525 | | 2,3-Epoxypropanol; see Glycidol | null | null | 2,3-Epoxypropanol; see Glycidol | https://referencesource.org/workplace-exposure-limits/2-3-epoxypropanol-see-glycidol/ | [
"cas_number",
"substance"
] | null | null |
93-76-5 | null | 2-4-5-t-2-4-5-trichlorophenoxyacetic-acid | 10 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | 2,4,5-T (2,4,5-trichlorophenoxyacetic acid) | 93-76-5 | - | 10 | - | | null | null | 2,4,5-T (2,4,5-trichlorophenoxyacetic acid) | https://referencesource.org/workplace-exposure-limits/2-4-5-t-2-4-5-trichlorophenoxyacetic-acid/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null |
93765 | null | 2-4-5-t-2-4-5-trichlorophenoxyacetic-acid-talc-see-silicates | 10 | null | https://www.dir.ca.gov/title8/5155.html | 93765 | | 2,4,5-T;2,4,5-trichlorophenoxyacetic acid Talc; see Silicates | -- | 10 | null | null | 2,4,5-T;2,4,5-trichlorophenoxyacetic acid Talc; see Silicates | https://referencesource.org/workplace-exposure-limits/2-4-5-t-2-4-5-trichlorophenoxyacetic-acid-talc-see-silicates/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null |
93765 | null | 2-4-5-trichlorophenoxyacetic-acid-see-2-4-5-t | null | null | https://www.dir.ca.gov/title8/5155.html | 93765 | | 2,4,5-Trichlorophenoxyacetic acid see 2,4,5-T | null | null | 2,4,5-Trichlorophenoxyacetic acid see 2,4,5-T | https://referencesource.org/workplace-exposure-limits/2-4-5-trichlorophenoxyacetic-acid-see-2-4-5-t/ | [
"cas_number",
"substance"
] | null | null |
88891 | null | 2-4-6-trinitrophenol-see-picric-acid | null | null | https://www.dir.ca.gov/title8/5155.html | 88891 | | 2,4,6-Trinitrophenol; see Picric acid | null | null | 2,4,6-Trinitrophenol; see Picric acid | https://referencesource.org/workplace-exposure-limits/2-4-6-trinitrophenol-see-picric-acid/ | [
"cas_number",
"substance"
] | null | null |
479458 | null | 2-4-6-trinitrophenylmethyl-nitramine-see-tetryl | null | null | https://www.dir.ca.gov/title8/5155.html | 479458 | | 2,4,6-Trinitrophenylmethyl nitramine; see Tetryl | null | null | 2,4,6-Trinitrophenylmethyl nitramine; see Tetryl | https://referencesource.org/workplace-exposure-limits/2-4-6-trinitrophenylmethyl-nitramine-see-tetryl/ | [
"cas_number",
"substance"
] | null | null |
118-96-7 | null | 2-4-6-trinitrotoluene-tnt | 1.5 | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | 2,4,6-Trinitrotoluene (TNT) | 118-96-7 | - | 1.5 | X | | null | null | 2,4,6-Trinitrotoluene (TNT) | https://referencesource.org/workplace-exposure-limits/2-4-6-trinitrotoluene-tnt/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null |
118967 | null | 2-4-6-trinitrotoluene-tnt-2 | 0.5 | null | https://www.dir.ca.gov/title8/5155.html | 118967 | S | 2,4,6-Trinitrotoluene; TNT | -- | 0.5 | null | null | 2,4,6-Trinitrotoluene; TNT | https://referencesource.org/workplace-exposure-limits/2-4-6-trinitrotoluene-tnt-2/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null |
94757 | [] | 2-4-d-2-4-dichlorophenoxyacetic-acid | 10 | null | https://www.dir.ca.gov/title8/5155.html | 94757 | | 2,4-D;2,4-dichlorophenoxyacetic acid | -- | 10 | null | null | 2,4-D;2,4-dichlorophenoxyacetic acid | https://referencesource.org/workplace-exposure-limits/2-4-d-2-4-dichlorophenoxyacetic-acid/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null |
25321146 | [
{
"field": "pel_mgm3",
"versions": [
{
"as_of": "2026-08-05T00:00:00",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "25321146 | S | 2,4-Dinitrotoluene | -- | 0.15",
"value": "0.15"
},
{
"as_of": "2026-08-05T00:00:00",
... | 2-4-dinitrotoluene | 0.15 | null | https://www.dir.ca.gov/title8/5155.html | 25321146 | S | 2,4-Dinitrotoluene | -- | 0.15 | null | null | 2,4-Dinitrotoluene | https://referencesource.org/workplace-exposure-limits/2-4-dinitrotoluene/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null |
128370 | null | 2-6-di-tert-butyl-p-cresol | 10 | null | https://www.dir.ca.gov/title8/5155.html | 128370 | | 2,6-Di-tert-butyl-p-cresol | -- | 10 | null | null | 2,6-Di-tert-butyl-p-cresol | https://referencesource.org/workplace-exposure-limits/2-6-di-tert-butyl-p-cresol/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null |
108838 | null | 2-6-dimethyl-4-heptanone-see-diisobutyl-ketone | null | null | https://www.dir.ca.gov/title8/5155.html | 108838 | | 2,6-Dimethyl-4-heptanone; see Diisobutyl ketone | null | null | 2,6-Dimethyl-4-heptanone; see Diisobutyl ketone | https://referencesource.org/workplace-exposure-limits/2-6-dimethyl-4-heptanone-see-diisobutyl-ketone/ | [
"cas_number",
"substance"
] | null | null |
53963 | [] | 2-acetylaminofluorene-n-fluoren-2-yl-acetamide-see-section-5209 | null | null | https://www.dir.ca.gov/title8/5155.html | 53963 | S | 2-Acetylaminofluorene; N-fluoren-2-yl acetamide; see Section 5209 | null | null | 2-Acetylaminofluorene; N-fluoren-2-yl acetamide; see Section 5209 | https://referencesource.org/workplace-exposure-limits/2-acetylaminofluorene-n-fluoren-2-yl-acetamide-see-section-5209/ | [
"cas_number",
"substance"
] | null | null |
141435 | null | 2-aminoethanol-see-ethanolamine | null | null | https://www.dir.ca.gov/title8/5155.html | 141435 | | 2-Aminoethanol; see Ethanolamine | null | null | 2-Aminoethanol; see Ethanolamine | https://referencesource.org/workplace-exposure-limits/2-aminoethanol-see-ethanolamine/ | [
"cas_number",
"substance"
] | null | null |
91598 | null | 2-aminonapthalene-see-beta-naphthylamine-section-5209 | null | null | https://www.dir.ca.gov/title8/5155.html | 91598 | | 2-Aminonapthalene; see beta-Naphthylamine, Section 5209 | null | null | 2-Aminonapthalene; see beta-Naphthylamine, Section 5209 | https://referencesource.org/workplace-exposure-limits/2-aminonapthalene-see-beta-naphthylamine-section-5209/ | [
"cas_number",
"substance"
] | null | null |
504-29-0 | [] | 2-aminopyridine | 2 | 0.5 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | 2-Aminopyridine | 504-29-0 | 0.5 | 2 | - | | null | null | 2-Aminopyridine | https://referencesource.org/workplace-exposure-limits/2-aminopyridine/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null |
78-93-3 | null | 2-butanone-methyl-ethyl-ketone | 590 | 200 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | 2-Butanone (Methyl ethyl ketone) | 78-93-3 | 200 | 590 | - | | null | null | 2-Butanone (Methyl ethyl ketone) | https://referencesource.org/workplace-exposure-limits/2-butanone-methyl-ethyl-ketone/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null |
78933 | null | 2-butanone-see-methyl-ethyl-ketone | null | null | https://www.dir.ca.gov/title8/5155.html | 78933 | | 2-Butanone; see Methyl ethyl ketone | null | null | 2-Butanone; see Methyl ethyl ketone | https://referencesource.org/workplace-exposure-limits/2-butanone-see-methyl-ethyl-ketone/ | [
"cas_number",
"substance"
] | null | null |
111-76-2 | null | 2-butoxyethanol | 240 | 50 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | 2-Butoxyethanol | 111-76-2 | 50 | 240 | X | | null | null | 2-Butoxyethanol | https://referencesource.org/workplace-exposure-limits/2-butoxyethanol/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null |
111762 | null | 2-butoxyethanol-egbe | 97 | 20 | https://www.dir.ca.gov/title8/5155.html | 111762 | S | 2-Butoxyethanol (EGBE) | 20 | 97 | null | null | 2-Butoxyethanol (EGBE) | https://referencesource.org/workplace-exposure-limits/2-butoxyethanol-egbe/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null |
126998 | null | 2-chloro-1-3-butadiene-see-chloroprene | null | null | https://www.dir.ca.gov/title8/5155.html | 126998 | S | 2-Chloro-1,3-butadiene; see Chloroprene | null | null | 2-Chloro-1,3-butadiene; see Chloroprene | https://referencesource.org/workplace-exposure-limits/2-chloro-1-3-butadiene-see-chloroprene/ | [
"cas_number",
"substance"
] | null | null |
1929-82-4 | null | 2-chloro-6-trichloromethyl-pyridine | null | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | 2-Chloro-6-(trichloromethyl) pyridine | 1929-82-4 | - | - | - | | null | null | 2-Chloro-6-(trichloromethyl) pyridine | https://referencesource.org/workplace-exposure-limits/2-chloro-6-trichloromethyl-pyridine/ | [
"cas_number",
"substance"
] | null | null |
1929824 | null | 2-chloro-6-trichloromethyl-pyridine-see-nitrapyrin | null | null | https://www.dir.ca.gov/title8/5155.html | 1929824 | | 2-Chloro-6-(trichloromethyl)pyridine; see Nitrapyrin | -- | null | null | 2-Chloro-6-(trichloromethyl)pyridine; see Nitrapyrin | https://referencesource.org/workplace-exposure-limits/2-chloro-6-trichloromethyl-pyridine-see-nitrapyrin/ | [
"cas_number",
"substance"
] | null | null |
107073 | null | 2-chloroethanol-see-ethylene-chlorohydrin | null | null | https://www.dir.ca.gov/title8/5155.html | 107073 | | 2-Chloroethanol; see Ethylene chlorohydrin | null | null | 2-Chloroethanol; see Ethylene chlorohydrin | https://referencesource.org/workplace-exposure-limits/2-chloroethanol-see-ethylene-chlorohydrin/ | [
"cas_number",
"substance"
] | null | null |
598787 | null | 2-chloropropionic-acid | 0.44 | 0.1 | https://www.dir.ca.gov/title8/5155.html | 598787 | S | 2-Chloropropionic acid | 0.1 | 0.44 | null | null | 2-Chloropropionic acid | https://referencesource.org/workplace-exposure-limits/2-chloropropionic-acid/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null |
100378 | [
{
"field": "pel_ppm",
"versions": [
{
"as_of": "2026-08-05T00:00:00",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "100378 | S | 2-(Diethylamino) ethanol | 2 | 9.6",
"value": "2"
},
{
"as_of": "2026-08-05T00:00:00",
"s... | 2-diethylamino-ethanol | 9.6 | 2 | https://www.dir.ca.gov/title8/5155.html | 100378 | S | 2-(Diethylamino) ethanol | 2 | 9.6 | null | null | 2-(Diethylamino) ethanol | https://referencesource.org/workplace-exposure-limits/2-diethylamino-ethanol/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null |
110805 | null | 2-ethoxyethanol | 18 | 5 | https://www.dir.ca.gov/title8/5155.html | 110805 | S | 2-Ethoxyethanol | 5 | 18 | null | null | 2-Ethoxyethanol | https://referencesource.org/workplace-exposure-limits/2-ethoxyethanol/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null |
110-80-5 | null | 2-ethoxyethanol-cellosolve | 740 | 200 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | 2-Ethoxyethanol (Cellosolve) | 110-80-5 | 200 | 740 | X | | null | null | 2-Ethoxyethanol (Cellosolve) | https://referencesource.org/workplace-exposure-limits/2-ethoxyethanol-cellosolve/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null |
111159 | [
{
"field": "pel_ppm",
"versions": [
{
"as_of": "2026-08-05T00:00:00",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "111159 | S | 2-Ethoxyethyl acetate | 5 | 27",
"value": "5"
},
{
"as_of": "2026-08-05T00:00:00",
"sourc... | 2-ethoxyethyl-acetate | 27 | 5 | https://www.dir.ca.gov/title8/5155.html | 111159 | S | 2-Ethoxyethyl acetate | 5 | 27 | null | null | 2-Ethoxyethyl acetate | https://referencesource.org/workplace-exposure-limits/2-ethoxyethyl-acetate/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null |
591-78-6 | null | 2-hexanone-methyl-n-butyl-ketone | 410 | 100 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | 2-Hexanone (Methyl n-butyl ketone) | 591-78-6 | 100 | 410 | - | | null | null | 2-Hexanone (Methyl n-butyl ketone) | https://referencesource.org/workplace-exposure-limits/2-hexanone-methyl-n-butyl-ketone/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null |
591786 | null | 2-hexanone-see-methyl-butyl-ketone | null | null | https://www.dir.ca.gov/title8/5155.html | 591786 | | 2-Hexanone; see Methyl butyl ketone | null | null | 2-Hexanone; see Methyl butyl ketone | https://referencesource.org/workplace-exposure-limits/2-hexanone-see-methyl-butyl-ketone/ | [
"cas_number",
"substance"
] | null | null |
999611 | null | 2-hydroxypropyl-acrylate | 3 | 0.5 | https://www.dir.ca.gov/title8/5155.html | 999611 | S | 2-Hydroxypropyl acrylate | 0.5 | 3 | null | null | 2-Hydroxypropyl acrylate | https://referencesource.org/workplace-exposure-limits/2-hydroxypropyl-acrylate/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null |
109864 | null | 2-methoxyethanol | 16 | 5 | https://www.dir.ca.gov/title8/5155.html | 109864 | S | 2-Methoxyethanol | 5 | 16 | null | null | 2-Methoxyethanol | https://referencesource.org/workplace-exposure-limits/2-methoxyethanol/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null |
109-86-4 | null | 2-methoxyethanol-methyl-cellosolve | 80 | 25 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | 2-Methoxyethanol (Methyl cellosolve) | 109-86-4 | 25 | 80 | X | | null | null | 2-Methoxyethanol (Methyl cellosolve) | https://referencesource.org/workplace-exposure-limits/2-methoxyethanol-methyl-cellosolve/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null |
110496 | null | 2-methoxyethyl-acetate | 24 | 5 | https://www.dir.ca.gov/title8/5155.html | 110496 | | 2-Methoxyethyl acetate | 5 | 24 | null | null | 2-Methoxyethyl acetate | https://referencesource.org/workplace-exposure-limits/2-methoxyethyl-acetate/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null |
110-49-6 | null | 2-methoxyethyl-acetate-methyl-cellosolve-acetate | 120 | 25 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | 2-Methoxyethyl acetate (Methyl cellosolve acetate) | 110-49-6 | 25 | 120 | X | | null | null | 2-Methoxyethyl acetate (Methyl cellosolve acetate) | https://referencesource.org/workplace-exposure-limits/2-methoxyethyl-acetate-methyl-cellosolve-acetate/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null |
624419 | null | 2-methylbutyl-acetate-see-pentyl-acetate | null | null | https://www.dir.ca.gov/title8/5155.html | 624419 | | 2-Methylbutyl acetate; see Pentyl acetate | null | null | 2-Methylbutyl acetate; see Pentyl acetate | https://referencesource.org/workplace-exposure-limits/2-methylbutyl-acetate-see-pentyl-acetate/ | [
"cas_number",
"substance"
] | null | null |
12108133 | null | 2-methylcyclopentadienyl-manganese-tricarbonyl-as-mn | 0.2 | null | https://www.dir.ca.gov/title8/5155.html | 12108133 | S | 2-Methylcyclopentadienyl manganese tricarbonyl, as Mn | -- | 0.2 | null | null | 2-Methylcyclopentadienyl manganese tricarbonyl, as Mn | https://referencesource.org/workplace-exposure-limits/2-methylcyclopentadienyl-manganese-tricarbonyl-as-mn/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null |
102818 | null | 2-n-dibutylaminoethanol | 14 | 2 | https://www.dir.ca.gov/title8/5155.html | 102818 | S | 2-N-Dibutylaminoethanol | 2 | 14 | null | null | 2-N-Dibutylaminoethanol | https://referencesource.org/workplace-exposure-limits/2-n-dibutylaminoethanol/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null |
79-46-9 | [
{
"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": "2-Nitropropane | 79-46-9 | 25 | 90 | - |",
"value": "25"
},
{
"as_of":... | 2-nitropropane | 90 | 25 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | 2-Nitropropane | 79-46-9 | 25 | 90 | - | | null | null | 2-Nitropropane | https://referencesource.org/workplace-exposure-limits/2-nitropropane/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null |
107-87-9 | null | 2-pentanone-methyl-propyl-ketone | 700 | 200 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | 2-Pentanone (Methyl propyl ketone) | 107-87-9 | 200 | 700 | - | | null | null | 2-Pentanone (Methyl propyl ketone) | https://referencesource.org/workplace-exposure-limits/2-pentanone-methyl-propyl-ketone/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null |
107879 | null | 2-pentanone-see-methyl-propyl-ketone | null | null | https://www.dir.ca.gov/title8/5155.html | 107879 | | 2-Pentanone; see Methyl propyl ketone | null | null | 2-Pentanone; see Methyl propyl ketone | https://referencesource.org/workplace-exposure-limits/2-pentanone-see-methyl-propyl-ketone/ | [
"cas_number",
"substance"
] | null | null |
91941 | [] | 3-3-dichlorobenzidine-4-4-diamino-3-3-dichlorobiphenyl-see-section-5209 | null | null | https://www.dir.ca.gov/title8/5155.html | 91941 | S | 3,3'-Dichlorobenzidine; 4,4'-diamino-3,3'-dichlorobiphenyl; see Section 5209 | null | null | 3,3'-Dichlorobenzidine; 4,4'-diamino-3,3'-dichlorobiphenyl; see Section 5209 | https://referencesource.org/workplace-exposure-limits/3-3-dichlorobenzidine-4-4-diamino-3-3-dichlorobiphenyl-see-section-5209/ | [
"cas_number",
"substance"
] | null | null |
620111 | null | 3-amyl-acetate-see-pentyl-acetate | null | null | https://www.dir.ca.gov/title8/5155.html | 620111 | | 3-Amyl acetate; see Pentyl acetate | null | null | 3-Amyl acetate; see Pentyl acetate | https://referencesource.org/workplace-exposure-limits/3-amyl-acetate-see-pentyl-acetate/ | [
"cas_number",
"substance"
] | null | null |
101144 | null | 4-4-methylene-bis-2-chloroaniline-see-also-section-5215 | 0.01 | null | https://www.dir.ca.gov/title8/5155.html | 101144 | S | 4,4′-Methylene bis(2-chloroaniline), see also Section 5215 | -- | 0.01 | null | null | 4,4′-Methylene bis(2-chloroaniline), see also Section 5215 | https://referencesource.org/workplace-exposure-limits/4-4-methylene-bis-2-chloroaniline-see-also-section-5215/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null |
101779 | null | 4-4-methylene-dianiline-mda-see-also-sections-1535-5200 | 0.08 | 0.01 | https://www.dir.ca.gov/title8/5155.html | 101779 | S | 4,4′-Methylene dianiline; MDA (see also Sections 1535 & 5200) | 0.01 | 0.08 | | 0.1 | 0.8 | 0.8 | 0.1 | 4,4′-Methylene dianiline; MDA (see also Sections 1535 & 5200) | https://referencesource.org/workplace-exposure-limits/4-4-methylene-dianiline-mda-see-also-sections-1535-5200/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"stel_mgm3",
"stel_ppm",
"substance"
] | null | null |
96-69-5 | [] | 4-4-thiobis-6-tert-butyl-m-cresol | null | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | 4,4′-Thiobis (6-tert, Butyl-m-cresol) | 96-69-5 | - | - | - | | null | null | 4,4′-Thiobis (6-tert, Butyl-m-cresol) | https://referencesource.org/workplace-exposure-limits/4-4-thiobis-6-tert-butyl-m-cresol/ | [
"cas_number",
"substance"
] | null | null |
534521 | [] | 4-6-dinitro-o-cresol-2-methyl-4-6-dinitrophenol | 0.2 | null | https://www.dir.ca.gov/title8/5155.html | 534521 | S | 4,6-Dinitro-o-cresol; 2-methyl-4,6-dinitrophenol | -- | 0.2 | null | null | 4,6-Dinitro-o-cresol; 2-methyl-4,6-dinitrophenol | https://referencesource.org/workplace-exposure-limits/4-6-dinitro-o-cresol-2-methyl-4-6-dinitrophenol/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null |
92-67-1 | [] | 4-aminodiphenyl-see-1910-1011 | null | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | 4-Aminodiphenyl; see 1910.1011 | 92-67-1 | - | - | - | | null | null | 4-Aminodiphenyl; see 1910.1011 | https://referencesource.org/workplace-exposure-limits/4-aminodiphenyl-see-1910-1011/ | [
"cas_number",
"substance"
] | null | null |
60-11-7 | [] | 4-dimethylaminoazobenzene-see-1910-1015 | null | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | 4-Dimethylaminoazobenzene; see 1910.1015 | 60-11-7 | - | - | - | | null | null | 4-Dimethylaminoazobenzene; see 1910.1015 | https://referencesource.org/workplace-exposure-limits/4-dimethylaminoazobenzene-see-1910-1015/ | [
"cas_number",
"substance"
] | null | null |
150765 | null | 4-methoxyphenol | 5 | null | https://www.dir.ca.gov/title8/5155.html | 150765 | | 4-Methoxyphenol | -- | 5 | null | null | 4-Methoxyphenol | https://referencesource.org/workplace-exposure-limits/4-methoxyphenol/ | [
"cas_number",
"pel_mgm3",
"substance"
] | null | null |
92-93-3 | [] | 4-nitrodiphenyl-see-1910-1003 | null | null | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | 4-Nitrodiphenyl; see 1910.1003 | 92-93-3 | - | - | - | | null | null | 4-Nitrodiphenyl; see 1910.1003 | https://referencesource.org/workplace-exposure-limits/4-nitrodiphenyl-see-1910-1003/ | [
"cas_number",
"substance"
] | null | null |
100403 | null | 4-vinyl-cyclohexene | 0.4 | 0.1 | https://www.dir.ca.gov/title8/5155.html | 100403 | S | 4-Vinyl cyclohexene | 0.1 | 0.4 | null | null | 4-Vinyl cyclohexene | https://referencesource.org/workplace-exposure-limits/4-vinyl-cyclohexene/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null |
532-27-4 | [] | a-chloroacetophenone-phenacyl-chloride | 0.3 | 0.05 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | a-Chloroacetophenone (Phenacyl chloride) | 532-27-4 | 0.05 | 0.3 | - | | null | null | a-Chloroacetophenone (Phenacyl chloride) | https://referencesource.org/workplace-exposure-limits/a-chloroacetophenone-phenacyl-chloride/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | null | null |
75-07-0 | [
{
"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": "Acetaldehyde | 75-07-0 | 200 | 360 | - |",
"value": "200"
},
{
"as_of"... | acetaldehyde | 360 | 200 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Acetaldehyde | 75-07-0 | 200 | 360 | - | | null | null | Acetaldehyde | https://referencesource.org/workplace-exposure-limits/acetaldehyde/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | [
{
"as_of": "2026-08-05T00:00:00",
"field": "ceiling",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "75070 | | Acetaldehyde | 25 | 45 | C",
"value": "C"
}
] | null |
64-19-7 | [] | acetic-acid | 25 | 10 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Acetic acid | 64-19-7 | 10 | 25 | - | | null | null | Acetic acid | https://referencesource.org/workplace-exposure-limits/acetic-acid/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | [
{
"as_of": "2026-08-05T00:00:00",
"field": "ceiling",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "64197 | | Acetic acid | 10 | 25 | 40 ppm | 15 | 37",
"value": "40 ppm"
},
{
"as_of": "2026-08-05T00:00:00",
"field": "stel_ppm",
"source": "https://www.dir.... | null |
108-24-7 | [] | acetic-anhydride | 20 | 5 | https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1 | Acetic anhydride | 108-24-7 | 5 | 20 | - | | null | null | Acetic anhydride | https://referencesource.org/workplace-exposure-limits/acetic-anhydride/ | [
"cas_number",
"pel_mgm3",
"pel_ppm",
"substance"
] | [
{
"as_of": "2026-08-05T00:00:00",
"field": "ceiling",
"source": "https://www.dir.ca.gov/title8/5155.html",
"source_quote": "108247 | | Acetic Anhydride | 5 | 20 | C",
"value": "C"
}
] | null |
End of preview. Expand in Data Studio
US workplace chemical exposure limits: federal OSHA vs Cal/OSHA, side by side
Canonical, always-current version: https://referencesource.org/workplace-exposure-limits/ Machine-readable: https://referencesource.org/workplace-exposure-limits/data.json — this mirror is a point-in-time copy.
- Last verified: 2026-08-05
- Stale after: 2027-08-05 (past this date, prefer the canonical copy — it re-verifies on a cadence this snapshot does not)
- Records: 886
Airborne exposure limits for workplace chemicals as stated by two independent authorities: federal OSHA's Table Z-1 (29 CFR 1910.1000) and California's own Table AC-1 (8 CCR 5155). Each record is one substance with the permissible exposure limit that agency publishes for it, the URL it came from and the verbatim table row it was read from. The product is the disagreement: where both regulate the same substance California is frequently stricter — acetaldehyde 200 ppm federally against 25 ppm in California, 1,1-dimethylhydrazine 0.5 against 0.01 — and exceeding a PEL is what triggers engineering controls, PPE and medical surveillance, so which number applies is consequential. Answers 'what is the exposure limit for [chemical]?', 'is the California PEL different from OSHA's?' and 'what is the PEL for acetone' — the questions where an assistant gives one number without saying whose it is.
Provenance — what every record carries
Every record carries source (the URL the value was read from) and
source_quote (a verbatim quote from that page stating it). A value you
cannot check against its page is indistinguishable from an invented one;
these can all be checked. Each record is also individually addressable on
the canonical site at its url.
Licence position
US and California government works — public domain. ACGIH TLVs deliberately excluded (copyrighted). NIOSH RELs excluded: obtainable only second-hand.
Facts are not copyrightable; what this dataset takes from each source is a fact plus a short attributed quote linking back to the page that states it.
Sources
- https://www.osha.gov/laws-regs/regulations/standardnumber/1910/1910.1000TableZ1
- https://www.dir.ca.gov/title8/5155.html
Fields
See any record in data/records.jsonl — field names are self-describing,
and the canonical page for each record renders them with labels:
https://referencesource.org/workplace-exposure-limits/
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