List of Hazardous Air Pollutants

CAS No. a Compound name F m 305 75070 Acetaldehyde 1.000 75058 Acetonitrile 0.989 98862 Acetophenone 0.314 98862 Acetophenone 0.314 107028 Acrolein 1.000 107131 Acrylonitrile 0.999 107051 Allyl chloride 1.000 71432 Benzene (includes benzene in gasoline) 1.000 98077 Benzotrichloride (isomers and mixture) 0.958 100447 Benzyl chloride 1.000 92524 Biphenyl 0.864 542881 Bis(chloromethyl)ether b 0.999 75252 Bromoform 0.998 106990 1,3-Butadiene 1.000 75150 Carbon disulfide 1.000 56235 Carbon Tetrachloride 1.000 43581 Carbonyl sulfide 1.000 133904 Chloramben 0.633 108907 Chlorobenzene 1.000 67663 Chloroform 1.000 107302 Chloromethyl methyl ether b 1.000 126998 Chloroprene 1.000 98828 Cumene 1.000 94757 2,4-D, salts and esters 0.167 334883 Diazomethane c 0.999 132649 Dibenzofurans 0.967 96128 B1,2-Dibromo-3-chloropropane 1.000 106467 1,4-Dichlorobenzene(p) 1.000 107062 Dichloroethane (Ethylene dichloride) 1.000 111444 Dichloroethyl ether (Bis(2-chloroethylether) 0.757 542756 1,3-Dichloropropene 1.000 64675 Diethyl sulfate 0.0025 79447 Dimethyl carbamoyl chloride c 0.150 77781 Dimethyl sulfate 0.086 121697 N,N-Dimethylaniline 0.0008 51285 2,4-Dinitrophenol 0.0077 121142 2,4-Dinitrotoluene 0.0848 123911 1,4-Dioxane (1,4-Diethyleneoxide) 0.869 106898 Epichlorohydrin (1-Chloro-2,3-epoxypropane) 0.939 106887 1,2-Epoxybutane 1.000 140885 Ethyl acrylate 1.000 100414 Ethyl benzene 1.000 75003 Ethyl chloride (Chloroethane) 1.000 106934 Ethylene dibromide (Dibromoethane) 0.999 107062 Ethylene dichloride (1,2-Dichloroethane) 1.000 151564 Ethylene imine (Aziridine) 0.867 75218 Ethylene oxide 1.000 75343 Ethylidene dichloride (1,1-Dichloroethane) Glycol ethers d that have a Henry's Law Constant value equal to or greater than 0.01 Y/X(1.8 × 10 −6 atm/gm-mole/m 3 ) at 25 °C 1.000 [ e ] 118741 Hexachlorobenzene 0.97 87683 Hexachlorobutadiene 0.88 67721 Hexachloroethane 0.499 110543 Hexane 1.000 78591 Isophorone 0.506 58899 Lindane (all isomers) 1.000 67561 Methanol 0.855 74839 Methyl bromide (Bromomethane) 1.000 74873 Methyl chloride (Choromethane) 1.000 71556 Methyl chloroform (1,1,1-Trichloroethane) 1.000 74884 Methyl iodide (Iodomethane) 1.000 108101 Methyl isobutyl ketone (Hexone) 0.979 624839 Methyl isocyanate 1.000 80626 Methyl methacrylate 0.999 1634044 Methyl tert butyl ether 1.000 75092 Methylene chloride (Dichloromethane) 1.000 91203 Naphthalene 0.994 98953 Nitrobenzene 0.394 79469 2-Nitropropane 0.989 82688 Pentachloronitrobenzene (Quintobenzene) 0.839 87865 Pentachlorophenol 0.0898 75445 Phosgene c 1.000 123386 Propionaldehyde 0.999 78875 Propylene dichloride (1,2-Dichloropropane) 1.000 75569 Propylene oxide 1.000 75558 1,2-Propylenimine (2-Methyl aziridine) 0.945 100425 Styrene 1.000 96093 Styrene oxide 0.830 79345 1,1,2,2-Tetrachloroethane 0.999 127184 Tetrachloroethylene (Perchloroethylene) 1.000 108883 Toluene 1.000 95534 o-Toluidine 0.152 120821 1,2,4-Trichlorobenzene 1.000 71556 1,1,1-Trichloroethane (Methyl chlorform) 1.000 79005 1,1,2-Trichloroethane (Vinyltrichloride) 1.000 79016 Trichloroethylene 1.000 95954 2,4,5-Trichlorophenol 0.0108 88062 2,4,6-Trichlorophenol 0.0132 121448 Triethylamine 1.000 540841 2,2,4-Trimethylpentane 1.000 108054 Vinyl acetate 1.000 593602 Vinyl bromide 1.000 75014 Vinyl chloride 1.000 75354 Vinylidene chloride (1,1-Dichloroethylene) 1.000 1330207 Xylenes (isomers and mixture) 1.000 95476 o-Xylenes 1.000 108383 m-Xylenes 1.000 106423 p-Xylenes 1.000 Notes: F m 305 Fraction measure factor in Method 305, 40 CFR 305 part 63, appendix A. a CAS numbers refer to the Chemical Abstracts Services registry number assigned to specific compounds, isomers, or mixtures of compounds. b Denotes a HAP that hydrolyzes quickly in water, but the hydrolysis products are also HAP chemicals. c Denotes a HAP that may react violently with water. d Denotes a HAP that hydrolyzes slowly in water. e The F m 305 factors for some of the more common glycol 305 ethers can be obtained by contacting the Waste and Chemical Processes Group, Office of Air Quality Planning and Standards, Research Triangle Park, NC 27711. [71 FR 69020, Nov. 29, 2006]