Air Quality
Section 112(r) of the Clean Air Act
Accidental Release Prevention Program
Below is a listing of the chemicals [with Chemical Abstract Service (CAS) number and threshold quantity in pounds] which are regulated under accidental release requirements of the Clean Air Act.
| Regulated Substance | CAS # | Threshold Quantity |
|---|---|---|
| 1,1-Dichloroethylene | 75354 | 10,000 |
| 1,1-Dimethyl hydrazine | 57147 | 15,000 |
| 1,2-Ethanediamine | 107153 | 20,000 |
| 1,2-Propadiene | 463490 | 10,000 |
| 1,3-Butadiene | 106990 | 10,000 |
| 1,3-Butadiene, 2-methyl- | 78795 | 10,000 |
| 1,3-Pentadiene | 504609 | 10,000 |
| 1-Buten-3-yne | 689974 | 10,000 |
| 1-Butene | 106989 | 10,000 |
| 1-Butyne | 107006 | 10,000 |
| 1-Chloropropylene | 590216 | 10,000 |
| 1-Pentene | 109671 | 10,000 |
| 1-Propene | 115071 | 10,000 |
| 1-Propene, 1-chloro- | 590216 | 10,000 |
| 1-Propene, 2-chloro- | 557982 | 10,000 |
| 1-Propene, 2-methyl- | 115117 | 10,000 |
| 1-Propyne | 74997 | 10,000 |
| 2,2-Dimethylpropane | 463821 | 10,000 |
| 2-Butenal | 4170303 | 20,000 |
| 2-Butenal, (e)- | 123739 | 20,000 |
| 2-Butene | 107017 | 10,000 |
| 2-Butene, (E) | 624646 | 10,000 |
| 2-Butene-cis | 590181 | 10,000 |
| 2-Butene-trans | 624646 | 10,000 |
| 2-Chloropropylene | 557982 | 10,000 |
| 2-Methyl-1-butene | 563462 | 10,000 |
| 2-Methylpropene | 115117 | 10,000 |
| 2-Pentene, (E)- | 646048 | 10,000 |
| 2-Pentene, (Z)- | 627203 | 10,000 |
| 2-Propanamine | 75310 | 10,000 |
| 2-Propen-1-amine | 107119 | 10,000 |
| 2-Propen-1-ol | 107186 | 15,000 |
| 2-Propenal | 107028 | 5,000 |
| 2-Propenenitrile | 107131 | 20,000 |
| 2-Propenenitrile, 2-methyl- | 126987 | 10,000 |
| 2-Propenoyl chloride | 814686 | 5,000 |
| 3-Methyl-1-butene | 563451 | 10,000 |
| Acetaldehyde | 75070 | 10,000 |
| Acetic acid ethenyl ester | 108054 | 15,000 |
| Acetylene | 74862 | 10,000 |
| Acrolein | 107028 | 5,000 |
| Acrylonitrile | 107131 | 20,000 |
| Acrylyl chloride | 814686 | 5,000 |
| Allyl alcohol | 107186 | 15,000 |
| Allylamine | 107119 | 10,000 |
| Ammonia (anhydrous) | 7664417 | 10,000 |
| Ammonia (conc 20% or greater) | 7664417 | 20,000 |
| Arsenous trichloride | 7784341 | 15,000 |
| Arsine | 7784421 | 1,000 |
| Aziridine | 151564 | 10,000 |
| Aziridine, 2-methyl | 75558 | 10,000 |
| Benzene, 1,3-diisocyanato-2-methyl- | 91087 | 10,000 |
| Benzene, 1,3-diisocyanatomethyl- | 26471625 | 10,000 |
| Benzene, 2,4-diisocyanato-1-methyl- | 584849 | 10,000 |
| Bis(chloromethyl) ether | 542881 | 1,000 |
| Borane, trichloro- | 10294345 | 5,000 |
| Borane, trifluoro- | 7637072 | 5,000 |
| Boron trichloride | 10294345 | 5,000 |
| Boron trifluoride | 7637072 | 5,000 |
| Boron trifluoride compound with methyl ether (1:1) | 353424 | 15,000 |
| Boron, trifluoro[oxybis[methane]]-, (T-4)- | 353424 | 15,000 |
| Bromine | 7726956 | 10,000 |
| Bromotrifluoroethylene | 598732 | 10,000 |
| Butane | 106978 | 10,000 |
| Butane, 2-methyl- | 78784 | 10,000 |
| Butene | 25167673 | 10,000 |
| Carbon disulfide | 75150 | 20,000 |
| Carbon oxide sulfide (COS) | 463581 | 10,000 |
| Carbonic dichloride | 75445 | 500 |
| Carbonochloridic acid, 1-methylethyl ester | 108236 | 15,000 |
| Carbonochloridic acid, methylester | 79221 | 5,000 |
| Carbonochloridic acid, propylester | 109615 | 15,000 |
| Carbonyl sulfide | 463581 | 10,000 |
| Chlorine | 7782505 | 2,500 |
| Chlorine dioxide | 10049044 | 1,000 |
| Chlorine monoxide | 7791211 | 10,000 |
| Chlorine oxide | 7791211 | 10,000 |
| Chlorine oxide (ClO2) | 10049044 | 1,000 |
| Chloroethane | 75003 | 10,000 |
| Chloroform | 67663 | 20,000 |
| Chloromethane | 74873 | 10,000 |
| Chloromethyl ether | 542881 | 1,000 |
| Chloromethyl methyl ether | 107302 | 5,000 |
| Crotonaldehyde | 4170303 | 20,000 |
| Crotonaldehyde, (E)- | 123739 | 20,000 |
| Cyanogen | 460195 | 10,000 |
| Cyanogen chloride | 506774 | 10,000 |
| Cyanogen chloride ((CN)Cl) | 506774 | 10,000 |
| Cyclohexanamine | 108918 | 15,000 |
| Cyclohexylamine | 108918 | 15,000 |
| Cyclopropane | 75194 | 10,000 |
| Diborane | 19287457 | 2,500 |
| Diborane(6) | 19287457 | 2,500 |
| Dichloromethyl ether | 542881 | 1,000 |
| Dichlorosilane | 4109960 | 10,000 |
| Difluoroethane | 75376 | 10,000 |
| Dimethylamine | 124403 | 10,000 |
| Dimethyldichlorosilane | 75785 | 5,000 |
| Dimethylhydrazine | 57147 | 15,000 |
| Epichlorohydrin | 106898 | 20,000 |
| Ethanamine | 75047 | 10,000 |
| Ethane | 74840 | 10,000 |
| Ethane, 1,1-difluoro- | 75376 | 10,000 |
| Ethane, 1,1'-oxybis- | 60297 | 10,000 |
| Ethane, chloro- | 75003 | 10,000 |
| Ethanedinitrile | 460195 | 10,000 |
| Ethaneperoxoic acid | 79210 | 10,000 |
| Ethanethiol | 75081 | 10,000 |
| Ethene | 74851 | 10,000 |
| Ethene, 1,1-dichloro- | 75354 | 10,000 |
| Ethene, 1,1-difluoro- | 75387 | 10,000 |
| Ethene, bromotrifluoro- | 598732 | 10,000 |
| Ethene, chloro- | 75014 | 10,000 |
| Ethene, chlorotrifluoro- | 79389 | 10,000 |
| Ethene, ethoxy- | 109922 | 10,000 |
| Ethene, fluoro- | 75025 | 10,000 |
| Ethene, methoxy- | 107255 | 10,000 |
| Ethene, tetrafluoro- | 116143 | 10,000 |
| Ethyl acetylene | 107006 | 10,000 |
| Ethyl chloride | 75003 | 10,000 |
| Ethyl cyanide | 107120 | 10,000 |
| Ethyl ether | 60297 | 10,000 |
| Ethyl mercaptan | 75081 | 10,000 |
| Ethyl nitrite | 109955 | 10,000 |
| Ethylene | 74851 | 10,000 |
| Ethylene oxide | 75218 | 10,000 |
| Ethylenediamine | 107153 | 20,000 |
| Ethyleneimine | 151564 | 10,000 |
| Ethyne | 74862 | 10,000 |
| Fluorine | 7782414 | 1,000 |
| Formaldehyde | 50000 | 15,000 |
| Formaldehyde (solution) | 50000 | 15,000 |
| Formic acid, methyl ester | 107313 | 10,000 |
| Furan | 110009 | 5,000 |
| Hydrazine | 302012 | 15,000 |
| Hydrazine, 1,1-dimethyl- | 57147 | 15,000 |
| Hydrazine, methyl- | 60344 | 15,000 |
| Hydrochloric acid (conc 37% or greater) | 7647010 | 15,000 |
| Hydrocyanic acid | 74908 | 2,500 |
| Hydrofluoric acid (conc. 50% or greater) | 7664393 | 1,000 |
| Hydrogen | 1333740 | 10,000 |
| Hydrogen chloride (anhydrous) | 7647010 | 5,000 |
| Hydrogen chloride (gas only) | 7647010 | 5,000 |
| Hydrogen cyanide | 74908 | 2,500 |
| Hydrogen fluoride (anhydrous) | 7664393 | 1,000 |
| Hydrogen selenide | 7783075 | 500 |
| Hydrogen sulfide | 7783064 | 10,000 |
| Iron carbonyl (Fe(CO)5), (TB-5-11)- | 13463406 | 2,500 |
| Iron, pentacarbonyl- | 13463406 | 2,500 |
| Isobutane | 75285 | 10,000 |
| Isobutyronitrile | 78820 | 20,000 |
| Isopentane | 78784 | 10,000 |
| Isoprene | 78795 | 10,000 |
| Isopropyl chloride | 75296 | 10,000 |
| Isopropyl chloroformate | 108236 | 15,000 |
| Isopropylamine | 75310 | 10,000 |
| Methacrylonitrile | 126987 | 10,000 |
| Methanamine | 74895 | 10,000 |
| Methanamine, N,N-dimethyl- | 75503 | 10,000 |
| Methanamine, N-methyl- | 124403 | 10,000 |
| Methane | 74828 | 10,000 |
| Methane, chloro- | 74873 | 10,000 |
| Methane, chloromethoxy- | 107302 | 5,000 |
| Methane, isocyanato- | 624839 | 10,000 |
| Methane, oxybis- | 115106 | 10,000 |
| Methane, oxybis[chloro- | 542881 | 1,000 |
| Methane, tetranitro- | 509148 | 10,000 |
| Methane, trichloro- | 67663 | 20,000 |
| Methanesulfenyl chloride, trichloro- | 594423 | 10,000 |
| Methanethiol | 74931 | 10,000 |
| Methyl chloride | 74873 | 10,000 |
| Methyl chlorocarbonate | 79221 | 5,000 |
| Methyl chloroformate | 79221 | 5,000 |
| Methyl ether | 115106 | 10,000 |
| Methyl formate | 107313 | 10,000 |
| Methyl hydrazine | 60344 | 15,000 |
| Methyl isocyanate | 624839 | 10,000 |
| Methyl mercaptan | 74931 | 10,000 |
| Methyl thiocyanate | 556649 | 20,000 |
| Methyltrichlorosilane | 75796 | 5,000 |
| Monoethylamine | 75047 | 10,000 |
| Monomethylamine | 74895 | 10,000 |
| Nickel carbonyl | 13463393 | 1,000 |
| Nitric acid (conc 80% or greater) | 7697372 | 15,000 |
| Nitric oxide | 10102439 | 10,000 |
| Nitrogen oxide (NO) | 10102439 | 10,000 |
| Nitrous acid, ethyl ester | 109955 | 10,000 |
| Oleum (fuming sulfuric acid) | 8014957 | 10,000 |
| Oxirane | 75218 | 10,000 |
| Oxirane, (chloromethyl)- | 106898 | 20,000 |
| Oxirane, methyl- | 75569 | 10,000 |
| Pentane | 109660 | 10,000 |
| Peracetic acid | 79210 | 10,000 |
| Perchloromethyl mercaptan | 594423 | 10,000 |
| Phosgene | 75445 | 500 |
| Phosphine | 7803512 | 5,000 |
| Phosphorous trichloride | 7719122 | 15,000 |
| Phosphorus oxychloride | 10025873 | 5,000 |
| Phosphorus trichloride | 7719122 | 15,000 |
| Phosphoryl chloride | 10025873 | 5,000 |
| Piperidine | 110894 | 15,000 |
| Plumbane, tetramethyl- | 75741 | 10,000 |
| Propadiene | 463490 | 10,000 |
| Propane | 74986 | 10,000 |
| Propane, 2,2-dimethyl- | 463821 | 10,000 |
| Propane, 2-chloro- | 75296 | 10,000 |
| Propane, 2-methyl | 75285 | 10,000 |
| Propanenitrile | 107120 | 10,000 |
| Propanenitrile, 2-methyl- | 78820 | 20,000 |
| Propene | 115071 | 10,000 |
| Propionitrile | 107120 | 10,000 |
| Propyl chloroformate | 109615 | 15,000 |
| Propylene | 115071 | 10,000 |
| Propylene oxide | 75569 | 10,000 |
| Propyleneimine | 75558 | 10,000 |
| Propyne | 74997 | 10,000 |
| Silane | 7803625 | 10,000 |
| Silane, chlorotrimethyl- | 75774 | 10,000 |
| Silane, dichloro- | 4109960 | 10,000 |
| Silane, dichlorodimethyl- | 75785 | 5,000 |
| Silane, tetramethyl- | 75763 | 10,000 |
| Silane, trichloro- | 10025782 | 10,000 |
| Silane, trichloromethyl- | 75796 | 5,000 |
| Sulfur dioxide (anhydrous) | 7446095 | 5,000 |
| Sulfur fluoride (SF4), (T-4)- | 7783600 | 2,500 |
| Sulfur tetrafluoride | 7783600 | 2,500 |
| Sulfur trioxide | 7446119 | 10,000 |
| Sulfuric acid (fuming) | 8014957 | 10,000 |
| Sulfuric acid, mixture with sulfur trioxide | 8014957 | 10,000 |
| Tetrafluoroethylene | 116143 | 10,000 |
| Tetramethyllead | 75741 | 10,000 |
| Tetramethylsilane | 75763 | 10,000 |
| Tetranitromethane | 509148 | 10,000 |
| Thiocyanic acid, methyl ester | 556649 | 20,000 |
| Thiomethanol | 74931 | 10,000 |
| Titanium chloride (TiCl4) (T-4)- | 7550450 | 2,500 |
| Titanium tetrachloride | 7550450 | 2,500 |
| Toluene diisocyanate (unspecified isomer) | 26471625 | 10,000 |
| Toluene-2,4-diisocyanate | 584849 | 10,000 |
| Toluene-2,6-diisocyanate | 91087 | 10,000 |
| Toluenediisocyanate (mixed isomers) | 26471625 | 10,000 |
| Trichloromethanesulfenyl chloride | 594423 | 10,000 |
| Trichlorosilane | 10025782 | 10,000 |
| Trifluorochloroethylene | 79389 | 10,000 |
| Trimethylamine | 75503 | 10,000 |
| Trimethylchlorosilane | 75774 | 10,000 |
| Vinyl acetate | 108054 | 15,000 |
| Vinyl acetate monomer | 108054 | 15,000 |
| Vinyl acetylene | 689974 | 10,000 |
| Vinyl chloride | 75014 | 10,000 |
| Vinyl ethyl ether | 109922 | 10,000 |
| Vinyl fluoride | 75025 | 10,000 |
| Vinyl methyl ether | 107255 | 10,000 |
| Vinylidene chloride | 75354 | 10,000 |
| Vinylidene fluoride | 75387 | 10,000 |
Return to Additional Resources
DHEC Accidental Release Prevention Contacts:
|
Heinz Kaiser, Section Manager
Air Toxics Section Phone: (803) 898-4089 Fax: (803) 898-4117 |
Angel Thompson Air Toxics Section Phone: (803) 898-4058 Fax: (803) 898-4117 |
For more information please contact us at (803) 898-4123 or by email.