{"data":{"id":"us/40-cfr-table-1-to-subpart-ggggg-of-part-63","jurisdiction":"us","citation":"40 CFR Table 1 to Subpart GGGGG of Part 63","heading":"Table 1 to Subpart GGGGG of Part 63—List of Hazardous Air Pollutants","body":"CAS No.a Compound name Fm 305\n75070 Acetaldehyde 1.000\n75058 Acetonitrile 0.989\n98862 Acetophenone 0.314\n98862 Acetophenone 0.314\n107028 Acrolein 1.000\n107131 Acrylonitrile 0.999\n107051 Allyl chloride 1.000\n71432 Benzene (includes benzene in gasoline) 1.000\n98077 Benzotrichloride (isomers and mixture) 0.958\n100447 Benzyl chloride 1.000\n92524 Biphenyl 0.864\n542881 Bis(chloromethyl)ether b 0.999\n75252 Bromoform 0.998\n106990 1,3-Butadiene 1.000\n75150 Carbon disulfide 1.000\n56235 Carbon Tetrachloride 1.000\n43581 Carbonyl sulfide 1.000\n133904 Chloramben 0.633\n108907 Chlorobenzene 1.000\n67663 Chloroform 1.000\n107302 Chloromethyl methyl ether b 1.000\n126998 Chloroprene 1.000\n98828 Cumene 1.000\n94757 2,4-D, salts and esters 0.167\n334883 Diazomethane c 0.999\n132649 Dibenzofurans 0.967\n96128 B1,2-Dibromo-3-chloropropane 1.000\n106467 1,4-Dichlorobenzene(p) 1.000\n107062 Dichloroethane (Ethylene dichloride) 1.000\n111444 Dichloroethyl ether (Bis(2-chloroethylether) 0.757\n542756 1,3-Dichloropropene 1.000\n64675 Diethyl sulfate 0.0025\n79447 Dimethyl carbamoyl chloride c 0.150\n77781 Dimethyl sulfate 0.086\n121697 N,N-Dimethylaniline 0.0008\n51285 2,4-Dinitrophenol 0.0077\n121142 2,4-Dinitrotoluene 0.0848\n123911 1,4-Dioxane (1,4-Diethyleneoxide) 0.869\n106898 Epichlorohydrin (1-Chloro-2,3-epoxypropane) 0.939\n106887 1,2-Epoxybutane 1.000\n140885 Ethyl acrylate 1.000\n100414 Ethyl benzene 1.000\n75003 Ethyl chloride (Chloroethane) 1.000\n106934 Ethylene dibromide (Dibromoethane) 0.999\n107062 Ethylene dichloride (1,2-Dichloroethane) 1.000\n151564 Ethylene imine (Aziridine) 0.867\n75218 Ethylene oxide 1.000\n75343 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/m3) at 25 °C 1.000 [e]\n118741 Hexachlorobenzene 0.97\n87683 Hexachlorobutadiene 0.88\n67721 Hexachloroethane 0.499\n110543 Hexane 1.000\n78591 Isophorone 0.506\n58899 Lindane (all isomers) 1.000\n67561 Methanol 0.855\n74839 Methyl bromide (Bromomethane) 1.000\n74873 Methyl chloride (Choromethane) 1.000\n71556 Methyl chloroform (1,1,1-Trichloroethane) 1.000\n74884 Methyl iodide (Iodomethane) 1.000\n108101 Methyl isobutyl ketone (Hexone) 0.979\n624839 Methyl isocyanate 1.000\n80626 Methyl methacrylate 0.999\n1634044 Methyl tert butyl ether 1.000\n75092 Methylene chloride (Dichloromethane) 1.000\n91203 Naphthalene 0.994\n98953 Nitrobenzene 0.394\n79469 2-Nitropropane 0.989\n82688 Pentachloronitrobenzene (Quintobenzene) 0.839\n87865 Pentachlorophenol 0.0898\n75445 Phosgene c 1.000\n123386 Propionaldehyde 0.999\n78875 Propylene dichloride (1,2-Dichloropropane) 1.000\n75569 Propylene oxide 1.000\n75558 1,2-Propylenimine (2-Methyl aziridine) 0.945\n100425 Styrene 1.000\n96093 Styrene oxide 0.830\n79345 1,1,2,2-Tetrachloroethane 0.999\n127184 Tetrachloroethylene (Perchloroethylene) 1.000\n108883 Toluene 1.000\n95534 o-Toluidine 0.152\n120821 1,2,4-Trichlorobenzene 1.000\n71556 1,1,1-Trichloroethane (Methyl chlorform) 1.000\n79005 1,1,2-Trichloroethane (Vinyltrichloride) 1.000\n79016 Trichloroethylene 1.000\n95954 2,4,5-Trichlorophenol 0.0108\n88062 2,4,6-Trichlorophenol 0.0132\n121448 Triethylamine 1.000\n540841 2,2,4-Trimethylpentane 1.000\n108054 Vinyl acetate 1.000\n593602 Vinyl bromide 1.000\n75014 Vinyl chloride 1.000\n75354 Vinylidene chloride (1,1-Dichloroethylene) 1.000\n1330207 Xylenes (isomers and mixture) 1.000\n95476 o-Xylenes 1.000\n108383 m-Xylenes 1.000\n106423 p-Xylenes 1.000\nNotes:\nFm 305 Fraction measure factor in Method 305, 40 CFR 305 part 63, appendix A.\na CAS numbers refer to the Chemical Abstracts Services registry number assigned to specific compounds, isomers, or mixtures of compounds.\nb Denotes a HAP that hydrolyzes quickly in water, but the hydrolysis products are also HAP chemicals.\nc Denotes a HAP that may react violently with water.\nd Denotes a HAP that hydrolyzes slowly in water.\ne The Fm 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.","path":["Title 40—Protection of Environment","CHAPTER I—ENVIRONMENTAL PROTECTION AGENCY","SUBCHAPTER C—AIR PROGRAMS","PART 63—NATIONAL EMISSION STANDARDS FOR HAZARDOUS AIR POLLUTANTS FOR SOURCE CATEGORIES","Subpart GGGGG—National Emission Standards for Hazardous Air Pollutants: Site Remediation"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-40.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:04Z","sha256":"4382b7b82f98a00472322b643552229af7eb9d44e4237479adf0ba64fd57d2c1","source_id":"us-cfr","stale":true,"prev":"us/40-cfr-63.7957","next":"us/40-cfr-table-2-to-subpart-ggggg-of-part-63"},"notice":"GroundRules: Original legal text. Not legal advice."}