| Chromium | 149.73 |
| Cobalt | 112.64 |
| Lead | 35.09 |
| Hydrazine | 30.50 |
| Ethylene oxide | 19.98 |
| Trichloroethylene | 11.93 |
| Nickel | 8.65 |
| Nickel compounds | 5.36 |
| Polycyclic aromatic compounds | 5.34 |
| Diisocyanates | 3.77 |
| Chloroform | 3.72 |
| Zinc compounds | 2.45 |
| Benzene | 1.43 |
| 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.) | 0.96 |
| Hydrogen cyanide | 0.85 |
| Formaldehyde | 0.46 |
| Antimony compounds | 0.34 |
| Di(2-ethylhexyl) phthalate | 0.29 |
| Maleic anhydride | 0.28 |
| Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 0.28 |
| Toluene diisocyanate (mixed isomers) | 0.23 |
| N,N-Dimethylformamide | 0.19 |
| Copper | 0.13 |
| Dicyclopentadiene | 0.12 |
| Toluene | 0.11 |
| Naphthalene | 0.08 |
| Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 0.06 |
| Triethylamine | 0.06 |
| Lead compounds | 0.05 |
| Ethylbenzene | 0.04 |
| Acrylonitrile | 0.03 |
| Peracetic acid | 0.03 |
| n-Hexane (Hexane) | 0.02 |
| Dichloromethane (Methylene chloride) | 0.02 |
| Nitric acid | 0.02 |
| Hydrogen fluoride (Hydrofluoric acid) | 0.01 |
| Xylene (mixed isomers) | 0.01 |
| Ethylene glycol | 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 | 0.01 |
| Certain glycol ethers | 0.01 |
| Toluene-2,4-diisocyanate | 0.00 |
| Butyl acrylate | 0.00 |
| Silver compounds | 0.00 |
| 1,2,4-Trimethylbenzene | 0.00 |
| Methyl tert-butyl ether | 0.00 |
| Manganese | 0.00 |
| Acetonitrile | 0.00 |
| Phthalic anhydride | 0.00 |
| Barium compounds (except for barium sulfate (CAS No. 7727-43-7)) | 0.00 |
| Methanol | 0.00 |
| Methyl methacrylate | 0.00 |
| Styrene | 0.00 |
| Benzo[g,h,i]perylene | 0.00 |
| Phenol | 0.00 |
| Acrylic acid | 0.00 |
| Ethyl acrylate | 0.00 |
| Cyclohexane | 0.00 |
| n-Butyl alcohol (1-Butanol) | 0.00 |
| Sodium nitrite | 0.00 |
| Methyl isobutyl ketone | 0.00 |
| Formic acid | 0.00 |
| Acetophenone | 0.00 |
| Nitrate compounds (water dissociable; reportable only when in aqueous solution) | 0.00 |
| Benzoyl peroxide | 0.00 |
| N-Methyl-2-pyrrolidone | 0.00 |
| Tetrabromobisphenol A | 0.00 |
