| Cobalt | 397.23 |
| Chromium | 256.32 |
| 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.) | 127.78 |
| Trichloroethylene | 60.08 |
| Nickel compounds | 26.56 |
| Ethylene oxide | 25.81 |
| Nickel | 20.13 |
| Hydrazine | 20.10 |
| Chloroform | 18.47 |
| Benzene | 13.12 |
| Lead | 12.15 |
| Diisocyanates | 7.84 |
| Di(2-ethylhexyl) phthalate | 1.05 |
| Zinc compounds | 1.01 |
| Polycyclic aromatic compounds | 0.96 |
| Naphthalene | 0.90 |
| Formaldehyde | 0.75 |
| Ethylbenzene | 0.70 |
| Toluene diisocyanate (mixed isomers) | 0.67 |
| Triethylamine | 0.23 |
| Lead compounds | 0.22 |
| Xylene (mixed isomers) | 0.21 |
| Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 0.21 |
| Antimony compounds | 0.18 |
| Copper | 0.14 |
| Hydrogen fluoride (Hydrofluoric acid) | 0.08 |
| Hydrogen cyanide | 0.05 |
| Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 0.05 |
| Dichloromethane (Methylene chloride) | 0.04 |
| N,N-Dimethylformamide | 0.04 |
| Certain glycol ethers | 0.04 |
| Nitric acid | 0.04 |
| 1,2,4-Trimethylbenzene | 0.03 |
| Toluene | 0.02 |
| 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) | 0.02 |
| n-Hexane (Hexane) | 0.01 |
| Toluene-2,4-diisocyanate | 0.01 |
| Acetonitrile | 0.01 |
| Silver compounds | 0.01 |
| Ethylene glycol | 0.01 |
| o-Xylene | 0.00 |
| Manganese | 0.00 |
| Pyridine | 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 |
| Aluminum (fume or dust) | 0.00 |
| Methyl methacrylate | 0.00 |
| Phenol | 0.00 |
| Methanol | 0.00 |
| Methyl tert-butyl ether | 0.00 |
| Mercury | 0.00 |
| Benzo[g,h,i]perylene | 0.00 |
| Cyclohexane | 0.00 |
| Propylene oxide | 0.00 |
| Styrene | 0.00 |
| Vinyl acetate | 0.00 |
| Sodium nitrite | 0.00 |
| 3-Iodo-2-propynyl butylcarbamate | 0.00 |
| Formic acid | 0.00 |
| Methyl isobutyl ketone | 0.00 |
| n-Butyl alcohol (1-Butanol) | 0.00 |
| Cumene | 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 |
| Nonylphenol Ethoxylates | 0.00 |
