List of Hazardous Air Pollutants (HAP) for Subpart DD

CAS No. a Chemical name f m 305 75-07-0 Acetaldehyde 1.000 75-05-8 Acetonitrile 0.989 98-86-2 Acetophenone 0.314 107-02-8 Acrolein 1.000 107-13-1 Acrylonitrile 0.999 107-05-1 Allyl chloride 1.000 71-43-2 Benzene (includes benzene in gasoline) 1.000 98-07-7 Benzotrichloride (isomers and mixture) 0.958 100-44-7 Benzyl chloride 1.000 92-52-4 Biphenyl 0.864 542-88-1 Bis(chloromethyl)ether b 0.999 75-25-2 Bromoform 0.998 106-99-0 1,3-Butadiene 1.000 75-15-0 Carbon disulfide 1.000 56-23-5 Carbon tetrachloride 1.000 43-58-1 Carbonyl sulfide 1.000 133-90-4 Chloramben 0.633 108-90-7 Chlorobenzene 1.000 67-66-3 Chloroform 1.000 107-30-2 Chloromethyl methyl ether b 1.000 126-99-8 Chloroprene 1.000 98-82-8 Cumene 1.000 94-75-7 2,4-D, salts and esters 0.167 334-88-3 Diazomethane c 0.999 132-64-9 Dibenzofurans 0.967 96-12-8 1,2-Dibromo-3-chloropropane 1.000 106-46-7 1,4-Dichlorobenzene(p) 1.000 107-06-2 Dichloroethane (Ethylene dichloride) 1.000 111-44-4 Dichloroethyl ether (Bis(2-chloroethyl ether) 0.757 542-75-6 1,3-Dichloropropene 1.000 79-44-7 Dimethyl carbamoyl chloride c 0.150 64-67-5 Diethyl sulfate 0.0025 77-78-1 Dimethyl sulfate 0.086 121-69-7 N,N-Dimethylaniline 0.0008 51-28-5 2,4-Dinitrophenol 0.0077 121-14-2 2,4-Dinitrotoluene 0.0848 123-91-1 1,4-Dioxane (1,4-Diethyleneoxide) 0.869 106-89-8 Epichlorohydrin (1-Chloro-2,3-epoxypropane) 0.939 106-88-7 1,2-Epoxybutane 1.000 140-88-5 Ethyl acrylate 1.000 100-41-4 Ethyl benzene 1.000 75-00-3 Ethyl chloride (Chloroethane) 1.000 106-93-4 Ethylene dibromide (Dibromoethane) 0.999 107-06-2 Ethylene dichloride (1,2-Dichloroethane) 1.000 151-56-4 Ethylene imine (Aziridine) 0.867 75-21-8 Ethylene oxide 1.000 75-34-3 Ethylidene dichloride (1,1-Dichloroethane) 1.000 Glycol ethers d that have a Henry's Law constant value equal to or greater than 0.1 Y/X (1.8 × 10 −6 atm/gm-mole/m 3 ) at 25°C (e) 118-74-1 Hexachlorobenzene 0.97 87-68-3 Hexachlorobutadiene 0.88 67-72-1 Hexachloroethane 0.499 110-54-3 Hexane 1.000 78-59-1 Isophorone 0.506 58-89-9 Lindane (all isomers) 1.000 67-56-1 Methanol 0.855 74-83-9 Methyl bromide (Bromomethane) 1.000 74-87-3 Methyl chloride (Choromethane) 1.000 71-55-6 Methyl chloroform (1,1,1-Trichloroethane) 1.000 78-93-3 Methyl ethyl ketone (2-Butanone) 0.990 74-88-4 Methyl iodide (Iodomethane) 1.0001 108-10-1 Methyl isobutyl ketone (Hexone) 0.9796 624-83-9 Methyl isocyanate 1.000 80-62-6 Methyl methacrylate 0.916 1634-04-4 Methyl tert butyl ether 1.000 75-09-2 Methylene chloride (Dichloromethane) 1.000 91-20-3 Naphthalene 0.994 98-95-3 Nitrobenzene 0.394 79-46-9 2-Nitropropane 0.989 82-68-8 Pentachloronitrobenzene (Quintobenzene) 0.839 87-86-5 Pentachlorophenol 0.0898 75-44-5 Phosgene c 1.000 123-38-6 Propionaldehyde 0.999 78-87-5 Propylene dichloride (1,2-Dichloropropane) 1.000 75-56-9 Propylene oxide 1.000 75-55-8 1,2-Propylenimine (2-Methyl aziridine) 0.945 100-42-5 Styrene 1.000 96-09-3 Styrene oxide 0.830 79-34-5 1,1,2,2-Tetrachloroethane 0.999 127-18-4 Tetrachloroethylene (Perchloroethylene) 1.000 108-88-3 Toluene 1.000 95-53-4 o-Toluidine 0.152 120-82-1 1,2,4-Trichlorobenzene 1.000 71-55-6 1,1,1-Trichloroethane (Methyl chlorform) 1.000 79-00-5 1,1,2-Trichloroethane (Vinyl trichloride) 1.000 79-01-6 Trichloroethylene 1.000 95-95-4 2,4,5-Trichlorophenol 0.108 88-06-2 2,4,6-Trichlorophenol 0.132 121-44-8 Triethylamine 1.000 540-84-1 2,2,4-Trimethylpentane 1.000 108-05-4 Vinyl acetate 1.000 593-60-2 Vinyl bromide 1.000 75-01-4 Vinyl chloride 1.000 75-35-4 Vinylidene chloride (1,1-Dichloroethylene) 1.000 1330-20-7 Xylenes (isomers and mixture) 1.000 95-47-6 o-Xylenes 1.000 108-38-3 m-Xylenes 1.000 106-42-3 p-Xylenes 1.000 Notes: f m 305 = Method 305 fraction measure factor. 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, exercise caustic is an expected analyte. d. Denotes a HAP that hydrolyzes slowly in water. e. The f m 305 factors for some of the more common glycol ethers can be obtained by contacting the Waste and Chemical Processes Group, Office of Air Quality Planning and Standards, Research Triangle Park, NC 27711. [64 FR 38981, July 20, 1999]