| Chromium | 121.01 |
| Cobalt | 104.93 |
| Ethylene oxide | 92.80 |
| 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.) | 85.35 |
| Trichloroethylene | 17.07 |
| Nickel | 8.90 |
| Nickel compounds | 8.03 |
| Diisocyanates | 5.81 |
| Lead | 5.11 |
| Chloroform | 4.24 |
| Cadmium compounds | 3.25 |
| Benzene | 1.78 |
| Antimony compounds | 0.93 |
| Di(2-ethylhexyl) phthalate | 0.48 |
| Maleic anhydride | 0.45 |
| Toluene diisocyanate (mixed isomers) | 0.45 |
| Zinc compounds | 0.36 |
| Polycyclic aromatic compounds | 0.36 |
| Formaldehyde | 0.34 |
| Dicyclopentadiene | 0.21 |
| Chlorine | 0.20 |
| Hydrogen fluoride (Hydrofluoric acid) | 0.10 |
| Naphthalene | 0.08 |
| Dichloromethane (Methylene chloride) | 0.07 |
| Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 0.06 |
| Xylene (mixed isomers) | 0.05 |
| Copper | 0.05 |
| Acrylonitrile | 0.05 |
| Ethylbenzene | 0.04 |
| Nitric acid | 0.04 |
| Peracetic acid | 0.04 |
| Triethylamine | 0.03 |
| Hydrogen cyanide | 0.03 |
| Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 0.03 |
| Certain glycol ethers | 0.03 |
| Lead compounds | 0.03 |
| N,N-Dimethylformamide | 0.03 |
| 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 |
| Acetonitrile | 0.02 |
| o-Xylene | 0.01 |
| Toluene | 0.01 |
| Pyridine | 0.01 |
| n-Hexane (Hexane) | 0.01 |
| Cyanide compounds | 0.00 |
| Silver compounds | 0.00 |
| Methyl tert-butyl ether | 0.00 |
| Butyl acrylate | 0.00 |
| Aluminum (fume or dust) | 0.00 |
| Ethylene glycol | 0.00 |
| 1,2,4-Trimethylbenzene | 0.00 |
| Phenol | 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 |
| Toluene-2,4-diisocyanate | 0.00 |
| Barium compounds (except for barium sulfate (CAS No. 7727-43-7)) | 0.00 |
| Phthalic anhydride | 0.00 |
| Manganese | 0.00 |
| Methanol | 0.00 |
| Styrene | 0.00 |
| Methyl methacrylate | 0.00 |
| Mercury | 0.00 |
| Acrylic acid | 0.00 |
| Silver | 0.00 |
| Ethyl acrylate | 0.00 |
| Benzo[g,h,i]perylene | 0.00 |
| Cyclohexane | 0.00 |
| Vinyl acetate | 0.00 |
| 3-Iodo-2-propynyl butylcarbamate | 0.00 |
| Formic acid | 0.00 |
| n-Butyl alcohol (1-Butanol) | 0.00 |
| Methyl isobutyl ketone | 0.00 |
| Nitrate compounds (water dissociable; reportable only when in aqueous solution) | 0.00 |
| Cumene | 0.00 |
| Benzoyl peroxide | 0.00 |
| Lithium carbonate | 0.00 |
| N-Methyl-2-pyrrolidone | 0.00 |
| Tetrabromobisphenol A | 0.00 |
| Nonylphenol Ethoxylates | 0.00 |
