| Chromium | 138.16 |
| Cobalt | 80.48 |
| Hydrazine | 37.72 |
| Ethylene oxide | 13.66 |
| Lead | 10.25 |
| Trichloroethylene | 8.07 |
| Nickel | 7.89 |
| Nickel compounds | 3.61 |
| Diisocyanates | 2.95 |
| Chloroform | 2.53 |
| Benzene | 1.09 |
| Chromium compounds (except for chromite ore mined in the Transvaal Region of South Africa and the unreacted ore component of the chromite ore processing residue (COPR). COPR is the solid waste remaining after aqueous extraction of oxidized chromite ore that has been combined with soda ash and kiln roasted at approximately 2,000 F.) | 0.89 |
| Zinc compounds | 0.71 |
| Polycyclic aromatic compounds | 0.49 |
| Formaldehyde | 0.49 |
| Antimony compounds | 0.30 |
| Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 0.30 |
| Maleic anhydride | 0.26 |
| Di(2-ethylhexyl) phthalate | 0.24 |
| N,N-Dimethylformamide | 0.21 |
| Toluene diisocyanate (mixed isomers) | 0.20 |
| Hydrogen cyanide | 0.13 |
| Dicyclopentadiene | 0.11 |
| Toluene | 0.09 |
| Naphthalene | 0.06 |
| Copper | 0.05 |
| Lead compounds | 0.04 |
| Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 0.03 |
| Ethylbenzene | 0.03 |
| Acrylonitrile | 0.03 |
| n-Hexane (Hexane) | 0.03 |
| Dichloromethane (Methylene chloride) | 0.02 |
| Peracetic acid | 0.02 |
| Triethylamine | 0.02 |
| Nitric acid | 0.02 |
| Ethylene glycol | 0.01 |
| Xylene (mixed isomers) | 0.01 |
| Certain glycol ethers | 0.01 |
| Hydrogen fluoride (Hydrofluoric acid) | 0.01 |
| Ammonia (includes anhydrous ammonia and aqueous ammonia from water dissociable ammonium salts and other sources; 10 percent of total aqueous ammonia is reportable under this listing) | 0.01 |
| o-Xylene | 0.00 |
| Butyl acrylate | 0.00 |
| 1,2,4-Trimethylbenzene | 0.00 |
| Silver compounds | 0.00 |
| Toluene-2,4-diisocyanate | 0.00 |
| Methyl tert-butyl ether | 0.00 |
| Barium compounds (except for barium sulfate (CAS No. 7727-43-7)) | 0.00 |
| Phthalic anhydride | 0.00 |
| Manganese | 0.00 |
| Acetonitrile | 0.00 |
| Methanol | 0.00 |
| Methyl methacrylate | 0.00 |
| Styrene | 0.00 |
| Benzo[g,h,i]perylene | 0.00 |
| Acrylic acid | 0.00 |
| Ethyl acrylate | 0.00 |
| Cyclohexane | 0.00 |
| Sodium nitrite | 0.00 |
| n-Butyl alcohol (1-Butanol) | 0.00 |
| Nitrate compounds (water dissociable; reportable only when in aqueous solution) | 0.00 |
| Methyl isobutyl ketone | 0.00 |
| Acetophenone | 0.00 |
| Formic acid | 0.00 |
| Copper compounds (this category does not include copper phthalocyanine compounds that are substituted with only hydrogen, and/or chlorine, and/or bromine.) | 0.00 |
| Benzoyl peroxide | 0.00 |
| N-Methyl-2-pyrrolidone | 0.00 |
| Tetrabromobisphenol A | 0.00 |
