| Chromium | 200.98 |
| Cobalt | 79.28 |
| Hydrazine | 24.52 |
| Ethylene oxide | 15.26 |
| Nickel | 8.23 |
| Lead | 7.83 |
| Trichloroethylene | 7.77 |
| Diisocyanates | 5.99 |
| Nickel compounds | 3.59 |
| 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.) | 3.26 |
| Chloroform | 2.29 |
| Formaldehyde | 1.41 |
| Benzene | 1.06 |
| Zinc compounds | 0.53 |
| Antimony compounds | 0.48 |
| Polycyclic aromatic compounds | 0.35 |
| Maleic anhydride | 0.33 |
| Di(2-ethylhexyl) phthalate | 0.19 |
| Toluene diisocyanate (mixed isomers) | 0.19 |
| Dicyclopentadiene | 0.18 |
| Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 0.11 |
| Hydrogen cyanide | 0.09 |
| N,N-Dimethylformamide | 0.08 |
| Naphthalene | 0.05 |
| Copper | 0.05 |
| Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 0.05 |
| Lead compounds | 0.04 |
| Toluene | 0.04 |
| Dichloromethane (Methylene chloride) | 0.04 |
| Acrylonitrile | 0.03 |
| Ethylbenzene | 0.03 |
| Nitric acid | 0.03 |
| Peracetic acid | 0.03 |
| Triethylamine | 0.02 |
| Certain glycol ethers | 0.02 |
| n-Hexane (Hexane) | 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 |
| Xylene (mixed isomers) | 0.01 |
| Hydrogen fluoride (Hydrofluoric acid) | 0.01 |
| Ethylene glycol | 0.00 |
| o-Xylene | 0.00 |
| Butyl acrylate | 0.00 |
| Methyl tert-butyl ether | 0.00 |
| Silver compounds | 0.00 |
| 1,2,4-Trimethylbenzene | 0.00 |
| Barium compounds (except for barium sulfate (CAS No. 7727-43-7)) | 0.00 |
| Toluene-2,4-diisocyanate | 0.00 |
| Phthalic anhydride | 0.00 |
| Phenol | 0.00 |
| Manganese | 0.00 |
| Acetonitrile | 0.00 |
| Methanol | 0.00 |
| Styrene | 0.00 |
| Methyl methacrylate | 0.00 |
| n-Butyl alcohol (1-Butanol) | 0.00 |
| Acrylic acid | 0.00 |
| Benzo[g,h,i]perylene | 0.00 |
| Ethyl acrylate | 0.00 |
| Cyclohexane | 0.00 |
| Sodium nitrite | 0.00 |
| Nitrate compounds (water dissociable; reportable only when in aqueous solution) | 0.00 |
| Acetophenone | 0.00 |
| Methyl isobutyl ketone | 0.00 |
| Formic acid | 0.00 |
| Benzoyl peroxide | 0.00 |
| Lithium carbonate | 0.00 |
| N-Methyl-2-pyrrolidone | 0.00 |
| Tetrabromobisphenol A | 0.00 |
