Regulations last checked for updates: May 18, 2024

Title 40 - Protection of Environment last revised: May 16, 2024
Appendix - Table 2 to Subpart F of Part 63—Organic Hazardous Air Pollutants
Chemical name a b CAS No. c
Acenaphthene83329
Acetaldehyde75070
Acetamide60355
Acetonitrile75058
Acetophenone98862
Acrolein107028
Acrylamide79061
Acrylic acid79107
Acrylonitrile107131
Alizarin72480
Allyl chloride107051
Aniline62533
Anisidine (o-)90040
Anthracene120127
Anthraquinone84651
Benzene71432
Benzotrichloride98077
Benzyl chloride100447
Biphenyl92524
Bis(chloromethyl)ether542881
Bromoform75252
Bromonaphthalene27497514
Butadiene (1,3-)106990
Carbon disulfide75150
Carbon tetrachloride56235
Chloroacetic acid79118
Chloroacetophenone (2-)532274
Chlorobenzene108907
2-Chloro-,1,3-butadiene (Chloroprene)126998
Chloroform67663
Chloronaphthalene25586430
Chrysene218019
Cresols and cresylic acids (mixed)1319773
Cresol and cresylic acid (o-)95487
Cresol and cresylic acid (m-)108394
Cresol and cresylic acid (p-)106445
Cumene98828
Dichlorobenzene (p-)106467
Dichlorobenzidine (3,3′-)91941
Dichloroethane (1,2-) (Ethylene dichloride) (EDC)107062
Dichloroethylether (Bis(2-chloroethyl)ether)111444
Dichloropropene (1,3-)542756
Diethanolamine (2,2′-Iminodiethanol)111422
Dimethylaniline (N,N-)121697
Diethyl sulfate64675
Dimethylbenzidine (3,3′-)119937
Dimethylformamide (N,N-)68122
Dimethylhydrazine (1,1-)58147
Dimethylphthalate131113
Dimethylsulfate77781
Dinitrophenol (2,4-)51285
Dinitrotoluene (2,4-)121142
Dioxane (1,4-) (1,4-Diethyleneoxide)123911
1,2-Diphenylhydrazine122667
Epichlorohydrin (1-Chloro-2,3-epoxypropane)106898
Ethyl acrylate140885
Ethylbenzene100414
Ethyl chloride (Chloroethane)75003
Ethylene dibromide (Dibromoethane)106934
Ethylene glycol107211
Ethylene oxide75218
Ethylidene dichloride (1,1-Dichloroethane)75343
Fluoranthene206440
Formaldehyde50000
Glycol ethers d
Hexachlorobenzene118741
Hexachlorobutadiene87683
Hexachloroethane67721
Hexane110543
Hydroquinone123319
Isophorone78591
Maleic anhydride108316
Methanol67561
Methylbromide (Bromomethane)74839
Methylchloride (Chloromethane)74873
Methyl hydrazine60344
Methyl isobutyl ketone (Hexone)108101
Methyl isocyanate624839
Methyl methacrylate80626
Methyl tert-butyl ether1634044
Methylene chloride (Dichloromethane)75092
Methylene diphenyl diisocyanate (4,4′-) (MDI)101688
Methylenedianiline (4,4′-)101779
Naphthalene91203
Naphthalene sulfonic acid (α)85472
Naphthalene sulfonic acid (β)120183
Naphthol (α)90153
Naphthol (β)135193
Naphtholsulfonic acid (1-)567180
Naphthylamine sulfonic acid (1,4-)84866
Naphthylamine sulfonic acid (2,1-)81163
Naphthylamine (1-)134327
Naphthylamine (2-)91598
Nitronaphthalene (1-)86577
Nitrobenzene98953
Nitrophenol (p-)100027
Nitropropane (2-)79469
Phenanthrene85018
Phenol108952
Phenylenediamine (p-)106503
Phosgene75445
Phthalic anhydride85449
Propiolactone (beta-)57578
Propionaldehyde123386
Propylene dichloride (1,2-Dichloropropane)78875
Propylene oxide75569
Pyrene129000
Quinone106514
Styrene100425
Tetrachloroethane (1,1,2,2-)79345
Tetrachloroethylene (Perchloroethylene)127184
Tetrahydronaphthalene119642
Toluene108883
Toluene diamine (2,4-)95807
Toluene diisocyanate (2,4-)584849
Toluidine (o-)95534
Trichlorobenzene (1,2,4-)120821
Trichloroethane (1,1,1-) (Methyl chloroform)71556
Trichloroethane (1,1,2-) (Vinyl trichloride)79005
Trichloroethylene79016
Trichlorophenol (2,4,5-)95954
Triethylamine121448
Trimethylpentane (2,2,4-)540841
Vinyl acetate108054
Vinyl chloride (Chloroethylene)75014
Vinylidene chloride (1,1-Dichloroethylene)75354
Xylenes (NOS)1330207
Xylene (m-)108383
Xylene (o-)95476
Xylene (p-)106423

a For all Listings above containing the word “Compounds,” the following applies: Unless otherwise specified, these listings are defined as including any unique chemical substance that contains the named chemical (i.e., antimony, arsenic) as part of that chemical's infrastructure.

b Isomer means all structural arrangements for the same number of atoms of each element and does not mean salts, esters, or derivatives.

c CAS No. = Chemical Abstract Service number.

d Includes mono- and di- ethers of ethylene glycol, diethylene glycol, and triethylene glycol R-(OCH2 CH2n-OR where:

n = 1, 2, or 3;

R = alkyl or aryl groups; and

R″ = R, H or groups which, when removed, yield glycol ethers with the structure:

R-(OCH2 CH2n-OH

Polymers are excluded from the glycol category.

[62 FR 2735, Jan. 17, 1997, as amended at 71 FR 76614, Dec. 21, 2006]
authority: 42 U.S.C. 7401
source: 57 FR 61992, Dec. 29, 1992, unless otherwise noted.