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Table 4 to Subpart F of Part 63 - Organic Hazardous Air Pollutants Subject to Cooling Tower Monitoring Requirements in §63.104

RegSenseCFR RegulationsEnvironmental Protection Agency (EPA)Hazardous Air PollutantsEnvironmentalAir QualityFocus AreaUSAEnglishAir ProgramsCFR Appendix

Chemical name CAS
Number a
a CAS Number = Chemical Abstract Service number.
Acetaldehyde 75070
Acetonitrile 75058
Acetophenone 98862
Acrolein 107028
Acrylonitrile 107131
Allyl chloride 107051
Aniline 62533
Anisidine (o-) 90040
Benzene 71432
Benzyl chloride 100447
Biphenyl 92524
Bromoform 75252
Butadiene (1,3-) 106990
Carbon disulfide 75150
Carbon tetrachloride 56235
Chloroacetophenone (2-) 532274
Chlorobenzene 108907
2-Chloro-1,3-butadiene (Chloroprene) 126998
Chloroform 67663
Cresol and cresylic acid (o-) 95487
Cresol and cresylic acid (m-) 108394
Cresol and cresylic acid (p-) 106445
Cumene 98828
Dichlorobenzene (p-) 106467
Dichlorobenzidine (3,3″-) 91941
Dichloroethane (1,2-) (Ethylene dichloride) (EDC) 107062
Dichloroethyl ether (Bis(2-chloroethyl)ether) 111444
Dichloropropene (1,3-) 542756
Diethylene glycol diethyl ether 112367
Diethylene glycol dimethyl ether 111966
Diethyl sulfate 64675
Dimethylaniline (N,N-) 121697
Dimethylhydrazine (1,1-) 57147
Dimethyl phthalate 131113
Dimethyl sulfate 77781
Dinitrophenol (2,4-) 51285
Dinitrotoluene (2,4-) 121142
Dioxane (1,4-) (1,4-Diethyleneoxide) 123911
Epichlorohydrin (1-Chloro-2,3-epoxypropane) 106898
Ethyl acrylate 140885
Ethylbenzene 100414
Ethyl chloride (Chloroethane) 75003
Ethylene dibromide (Dibromoethane) 106934
Ethylene glycol dimethyl ether 110714
Ethylene glycol monobutyl ether acetate 112072
Ethylene glycol monoethyl ether acetate 111159
Ethylene glycol monoethyl ether 110805
Ethylene glycol monomethyl ether 109864
Ethylene glycol monomethyl ether acetate 110496
Ethylene glycol monopropyl ether 2807309
Ethylene oxide 75218
Ethylidene dichloride (1,1-Dichloroethane) 75343
Formaldehyde 50000
Hexachlorobenzene 118741
Hexachlorobutadiene 87683
Hexachloroethane 67721
Hexane 110543
Isophorone 78591
Methanol 67561
Methyl bromide (Bromomethane) 74839
Methyl chloride (Chloromethane) 74873
Methyl hydrazine 60344
Methyl isobutyl ketone (Hexone) 108101
Methyl methacrylate 80626
Methyl tert-butyl ether 1634044
Methylene chloride (Dichloromethane) 75092
Methylenedianiline (4,4″-) 101779
Naphthalene 91203
Nitrobenzene 98953
Nitropropane (2-) 79469
Phenol 108952
Phenylenediamine (p-) 106503
Phosgene 75445
Propionaldehyde 123386
Propylene dichloride (1,2-Dichloropropane) 78875
Propylene oxide 75569
Quinone 106514
Styrene 100425
Tetrachloroethane (1,1,2,2-) 79345
Tetrachloroethylene (Perchloroethylene) 127184
Toluene 108883
Toluidine (o-) 95534
Trichlorobenzene (1,2,4-) 120821
Trichloroethane (1,1,1-) (Methyl chloroform) 71556
Trichloroethane (1,1,2-) (Vinyl trichloride) 79005
Trichloroethylene 79016
Trichlorophenol (2,4,5-) 95954
Triethylamine 121448
Trimethylpentane (2,2,4-) 540841
Vinyl acetate 108054
Vinyl chloride (chloroethylene) 75014
Vinylidene chloride (1,1-Dichloroethylene) 75354
Xylene (m-) 108383
Xylene (o-) 95476
Xylene (p-) 106423

[62 FR 2740, Jan. 17, 1997, as amended at 71 FR 76614, Dec. 21, 2006; 89 FR 43067, May 16, 2024]

['Air Programs']
['Hazardous Air Pollutants']
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