| Chromium | 179.74 |
| Cobalt | 92.52 |
| Hydrazine | 23.55 |
| Ethylene oxide | 18.81 |
| Lead | 13.16 |
| Trichloroethylene | 9.12 |
| Nickel | 8.42 |
| Diisocyanates | 4.70 |
| Nickel compounds | 4.21 |
| 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.) | 3.37 |
| Chloroform | 3.04 |
| Polycyclic aromatic compounds | 1.27 |
| Benzene | 1.13 |
| Formaldehyde | 1.04 |
| Zinc compounds | 0.91 |
| Antimony compounds | 0.44 |
| Maleic anhydride | 0.34 |
| Di(2-ethylhexyl) phthalate | 0.25 |
| Dicyclopentadiene | 0.18 |
| Toluene diisocyanate (mixed isomers) | 0.16 |
| Hydrogen cyanide | 0.12 |
| Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 0.12 |
| N,N-Dimethylformamide | 0.09 |
| Copper | 0.06 |
| Naphthalene | 0.06 |
| Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 0.06 |
| Lead compounds | 0.04 |
| Toluene | 0.04 |
| Acrylonitrile | 0.04 |
| Ethylbenzene | 0.03 |
| Peracetic acid | 0.03 |
| Triethylamine | 0.03 |
| Dichloromethane (Methylene chloride) | 0.03 |
| Nitric acid | 0.02 |
| n-Hexane (Hexane) | 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 |
| Xylene (mixed isomers) | 0.01 |
| o-Xylene | 0.00 |
| Ethylene glycol | 0.00 |
| Butyl acrylate | 0.00 |
| Toluene-2,4-diisocyanate | 0.00 |
| Silver compounds | 0.00 |
| Barium compounds (except for barium sulfate (CAS No. 7727-43-7)) | 0.00 |
| Methyl tert-butyl ether | 0.00 |
| 1,2,4-Trimethylbenzene | 0.00 |
| Phthalic anhydride | 0.00 |
| Phenol | 0.00 |
| Acetonitrile | 0.00 |
| Manganese | 0.00 |
| Methanol | 0.00 |
| Methyl methacrylate | 0.00 |
| Styrene | 0.00 |
| Acrylic acid | 0.00 |
| Ethyl acrylate | 0.00 |
| Benzo[g,h,i]perylene | 0.00 |
| n-Butyl alcohol (1-Butanol) | 0.00 |
| Cyclohexane | 0.00 |
| Sodium nitrite | 0.00 |
| Methyl isobutyl ketone | 0.00 |
| Acetophenone | 0.00 |
| Formic acid | 0.00 |
| Nitrate compounds (water dissociable; reportable only when in aqueous solution) | 0.00 |
| Benzoyl peroxide | 0.00 |
| Lithium carbonate | 0.00 |
| N-Methyl-2-pyrrolidone | 0.00 |
| Tetrabromobisphenol A | 0.00 |
