Regulations last checked for updates: Oct 30, 2025

Title 40 - Protection of Environment last revised: Sep 30, 2029
All TitlesTitle 40Chapter IPart 63Subpart GGGGGAppendix - Table 1 to Subpart GGGGG of Part 63—List of Hazardous Air Pollutants
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Appendix - Table 1 to Subpart GGGGG of Part 63—List of Hazardous Air Pollutants
CAS No. a Compound name Fm 305
75070Acetaldehyde1.000
75058Acetonitrile0.989
98862Acetophenone0.314
98862Acetophenone0.314
107028Acrolein1.000
107131Acrylonitrile0.999
107051Allyl chloride1.000
71432Benzene (includes benzene in gasoline)1.000
98077Benzotrichloride (isomers and mixture)0.958
100447Benzyl chloride1.000
92524Biphenyl0.864
542881Bis(chloromethyl)ether b0.999
75252Bromoform0.998
1069901,3-Butadiene1.000
75150Carbon disulfide1.000
56235Carbon Tetrachloride1.000
43581Carbonyl sulfide1.000
133904Chloramben0.633
108907Chlorobenzene1.000
67663Chloroform1.000
107302Chloromethyl methyl ether b1.000
126998Chloroprene1.000
98828Cumene1.000
947572,4-D, salts and esters0.167
334883Diazomethane c0.999
132649Dibenzofurans0.967
96128B1,2-Dibromo-3-chloropropane1.000
1064671,4-Dichlorobenzene(p)1.000
107062Dichloroethane (Ethylene dichloride)1.000
111444Dichloroethyl ether (Bis(2-chloroethylether)0.757
5427561,3-Dichloropropene1.000
64675Diethyl sulfate0.0025
79447Dimethyl carbamoyl chloride c0.150
77781Dimethyl sulfate0.086
121697N,N-Dimethylaniline0.0008
512852,4-Dinitrophenol0.0077
1211422,4-Dinitrotoluene0.0848
1239111,4-Dioxane (1,4-Diethyleneoxide)0.869
106898Epichlorohydrin (1-Chloro-2,3-epoxypropane)0.939
1068871,2-Epoxybutane1.000
140885Ethyl acrylate1.000
100414Ethyl benzene1.000
75003Ethyl chloride (Chloroethane)1.000
106934Ethylene dibromide (Dibromoethane)0.999
107062Ethylene dichloride (1,2-Dichloroethane)1.000
151564Ethylene imine (Aziridine)0.867
75218Ethylene oxide1.000
75343Ethylidene 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]
118741Hexachlorobenzene0.97
87683Hexachlorobutadiene0.88
67721Hexachloroethane0.499
110543Hexane1.000
78591Isophorone0.506
58899Lindane (all isomers)1.000
67561Methanol0.855
74839Methyl bromide (Bromomethane)1.000
74873Methyl chloride (Choromethane)1.000
71556Methyl chloroform (1,1,1-Trichloroethane)1.000
74884Methyl iodide (Iodomethane)1.000
108101Methyl isobutyl ketone (Hexone)0.979
624839Methyl isocyanate1.000
80626Methyl methacrylate0.999
1634044Methyl tert butyl ether1.000
75092Methylene chloride (Dichloromethane)1.000
91203Naphthalene0.994
98953Nitrobenzene0.394
794692-Nitropropane0.989
82688Pentachloronitrobenzene (Quintobenzene)0.839
87865Pentachlorophenol0.0898
75445Phosgene c1.000
123386Propionaldehyde0.999
78875Propylene dichloride (1,2-Dichloropropane)1.000
75569Propylene oxide1.000
755581,2-Propylenimine (2-Methyl aziridine)0.945
100425Styrene1.000
96093Styrene oxide0.830
793451,1,2,2-Tetrachloroethane0.999
127184Tetrachloroethylene (Perchloroethylene)1.000
108883Toluene1.000
95534o-Toluidine0.152
1208211,2,4-Trichlorobenzene1.000
715561,1,1-Trichloroethane (Methyl chlorform)1.000
790051,1,2-Trichloroethane (Vinyltrichloride)1.000
79016Trichloroethylene1.000
959542,4,5-Trichlorophenol0.0108
880622,4,6-Trichlorophenol0.0132
121448Triethylamine1.000
5408412,2,4-Trimethylpentane1.000
108054Vinyl acetate1.000
593602Vinyl bromide1.000
75014Vinyl chloride1.000
75354Vinylidene chloride (1,1-Dichloroethylene)1.000
1330207Xylenes (isomers and mixture)1.000
95476o-Xylenes1.000
108383m-Xylenes1.000
106423p-Xylenes1.000

Notes:

Fm 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 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.

[71 FR 69020, Nov. 29, 2006]
authority: 42 U.S.C. 7401
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