| Chemical Name
| Air Releases
(Pounds from TRI Sources)
| Regulated as a Hazardous Air Pollutant
by the Clean Air Act
|
| HYDROCHLORIC ACID | 599,037,557 | yes |
| TOLUENE | 63,340,242 | yes |
| STYRENE | 47,299,717 | yes |
| XYLENE (MIXED ISOMERS) | 42,175,104 | yes |
| ACETALDEHYDE | 12,807,359 | yes |
| FORMALDEHYDE | 10,114,909 | yes |
| TRICHLOROETHYLENE | 7,940,334 | yes |
| ZINC COMPOUNDS | 6,405,377 | no |
| BENZENE | 5,991,993 | yes |
| METHYL METHACRYLATE | 2,855,275 | yes |
| P-XYLENE | 1,232,060 | yes |
| LEAD COMPOUNDS | 1,174,210 | yes |
| TRIETHYLAMINE | 1,168,815 | yes |
| NICKEL COMPOUNDS | 939,065 | yes |
| ZINC | 891,964 | no |
| 2-CHLOR-1,3-BUTADIENE | 855,665 | yes |
| O-XYLENE | 747,040 | yes |
| OZONE | 694,151 | no |
| ACRYLONITRILE | 674,819 | yes |
| CHROMIUM COMPOUNDS | 564,203 | yes |
| DIMETHYLAMINE | 490,864 | no |
| M-XYLENE | 463,379 | yes |
| CREOSOTES | 428,288 | no |
| NICKEL | 402,386 | yes |
| ETHYLENE OXIDE | 399,017 | yes |
| ACRYLIC ACID | 349,196 | yes |
| MALEIC ANHYDRIDE | 323,252 | yes |
| LEAD | 284,466 | yes |
| CHROMIUM | 284,286 | yes |
| PROPYLENE OXIDE | 280,896 | yes |
| PHTHALIC ANHYDRIDE | 276,324 | yes |
| VANADIUM | 252,538 | no |
| DIMETHYL PHTHALATE | 249,250 | yes |
| METHYL ACRYLATE | 225,569 | no |
| BUTYL ACRYLATE | 175,081 | no |
| EPICHLOROHYDRIN | 167,642 | yes |
| 4,4'-ISOPROPYLIDENEDIPHENOL | 159,153 | no |
| ETHYL ACRYLATE | 124,566 | yes |
| DIBUTYL PHTHALATE | 117,307 | yes |
| 1,4-DIOXANE | 105,484 | yes |
| PYRIDINE | 78,915 | no |
| COBALT COMPOUNDS | 76,827 | yes |
| 1,2-DICHLOROBENZENE | 76,507 | no |
| NITROGLYCERIN | 55,343 | no |
| DIPHENYLAMINE | 38,007 | no |
| P-PHENYLENEDIAMINE | 31,062 | yes |
| COBALT | 24,808 | yes |
| ATRAZINE | 24,279 | no |
| MERCURY | 19,912 | yes |
| HYDROQUINONE | 12,862 | yes |
| 4,4'-METHYLENEDIANILINE | 12,457 | yes |
| ACRYLAMIDE | 12,312 | yes |
| METHAM SODIUM | 10,234 | no |
| CATECHOL | 10,217 | yes |
| 1,3-DICHLOROPROPENE (MIXED ISOMERS) | 9,860 | yes |
| DINITROTOLUENE (MIXED ISOMERS) | 8,043 | no |
| TRIFLURALIN | 6,775 | yes |
| BERYLLIUM COMPOUNDS | 5,822 | yes |
| POLYCHLORINATED BIPHENYLS | 5,201 | yes |
| 2-MERCAPTOBENZOTHIAZOLE | 4,937 | no |
| M-PHENYLENEDIAMINE | 4,831 | no |
| CARBARYL | 4,485 | yes |
| THIRAM | 4,083 | no |
| TOLUENE-2,4-DIISOCYANATE | 3,911 | yes |
| MALATHION | 2,698 | no |
| ARSENIC | 2,574 | yes |
| CHLOROTHALONIL | 2,300 | no |
| HYDRAZINE | 2,030 | yes |
| BENZOYL PEROXIDE | 1,813 | no |
| QUINTOZENE | 1,640 | yes |
| THIOUREA | 1,578 | no |
| CAPTAN | 1,498 | yes |
| PENTACHLOROPHENOL | 1,422 | yes |
| BERYLLIUM | 1,398 | yes |
| ALACHLOR | 1,291 | no |
| 2,4-DIAMINOTOLUENE | 1,255 | yes |
| CHLOROPHENOLS | 1,230 | no |
| HEXACHLOROBENZENE | 1,138 | yes |
| METHYL ISOTHIOCYANATE | 1,055 | no |
| CARBOFURAN | 703 | no |
| METHYL ISOCYANATE | 644 | yes |
| ASBESTOS (FRIABLE) | 634 | yes |
| O-PHENYLENEDIAMINE | 587 | no |
| TOLUENE-2,6-DIISOCYANATE | 575 | no |
| CADMIUM | 569 | yes |
| 2,4-DICHLOROPHENOL | 542 | no |
| TRICHLORFON | 505 | no |
| THIABENDAZOLE | 500 | no |
| PROPACHLOR | 356 | no |
| METHACRYLONITRILE | 335 | no |
| DICHLORVOS | 260 | yes |
| METHYL PARATHION | 255 | no |
| TRIFORINE | 255 | no |
| MANEB | 250 | no |
| 1-(3-CHLOROALLYL)-3,5,7-TRIAZA-1-AZONIAADAMANTANE CHLORIDE | 212 | no |
| 2,4,6-TRINITROPHENOL | 172 | no |
| ETHYLENE THIOUREA | 117 | yes |
| CALCIUM CYANAMIDE | 86 | yes |
| DAZOMET | 27 | no |
| BENZIDINE | 17 | yes |
| 3,3'-DICHLOROBENZIDINE | 15 | yes |
| GAMMA-LINDANE | 11 | yes |
| DICOFOL | 8 | no |
| HEXACHLOROPHENE (HCP) | 7 | no |
| FOLPET | 6 | no |
| DIGLYCIDYL RESORCINOL ETHER (DGRE) | 1 | no |