| Chromium | 172.78 |
| Cobalt | 163.80 |
| 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.) | 73.05 |
| Ethylene oxide | 32.91 |
| Trichloroethylene | 21.59 |
| Nickel | 11.84 |
| Lead | 11.65 |
| Nickel compounds | 9.55 |
| Chloroform | 5.79 |
| Diisocyanates | 4.66 |
| Benzene | 2.29 |
| Di(2-ethylhexyl) phthalate | 0.97 |
| Zinc compounds | 0.82 |
| Polycyclic aromatic compounds | 0.55 |
| Antimony compounds | 0.48 |
| Formaldehyde | 0.39 |
| Maleic anhydride | 0.33 |
| Dicyclopentadiene | 0.12 |
| Naphthalene | 0.11 |
| Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 0.09 |
| Triethylamine | 0.08 |
| Hydrogen cyanide | 0.07 |
| Copper | 0.07 |
| Hydrogen fluoride (Hydrofluoric acid) | 0.07 |
| Ethylbenzene | 0.06 |
| Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 0.06 |
| Toluene diisocyanate (mixed isomers) | 0.05 |
| Xylene (mixed isomers) | 0.05 |
| o-Xylene | 0.05 |
| N,N-Dimethylformamide | 0.04 |
| Acrylonitrile | 0.03 |
| Nitric acid | 0.03 |
| Peracetic acid | 0.03 |
| Lead compounds | 0.03 |
| Certain glycol ethers | 0.02 |
| Dichloromethane (Methylene chloride) | 0.02 |
| 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) | 0.01 |
| Acetonitrile | 0.01 |
| n-Hexane (Hexane) | 0.01 |
| Pyridine | 0.01 |
| Ethylene glycol | 0.00 |
| Toluene-2,4-diisocyanate | 0.00 |
| 1,2,4-Trimethylbenzene | 0.00 |
| Silver compounds | 0.00 |
| Butyl acrylate | 0.00 |
| Aluminum (fume or dust) | 0.00 |
| Manganese | 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 |
| Methyl tert-butyl ether | 0.00 |
| Phenol | 0.00 |
| Barium compounds (except for barium sulfate (CAS No. 7727-43-7)) | 0.00 |
| Phthalic anhydride | 0.00 |
| Methanol | 0.00 |
| Methyl methacrylate | 0.00 |
| Styrene | 0.00 |
| Mercury | 0.00 |
| Acrylic acid | 0.00 |
| Benzo[g,h,i]perylene | 0.00 |
| Ethyl acrylate | 0.00 |
| Cyclohexane | 0.00 |
| Vinyl acetate | 0.00 |
| Sodium nitrite | 0.00 |
| 3-Iodo-2-propynyl butylcarbamate | 0.00 |
| n-Butyl alcohol (1-Butanol) | 0.00 |
| Formic acid | 0.00 |
| Methyl isobutyl ketone | 0.00 |
| Nitrate compounds (water dissociable; reportable only when in aqueous solution) | 0.00 |
| Cumene | 0.00 |
| Cyanide compounds | 0.00 |
| Acetophenone | 0.00 |
| Benzoyl peroxide | 0.00 |
| Lithium carbonate | 0.00 |
| N-Methyl-2-pyrrolidone | 0.00 |
| Tetrabromobisphenol A | 0.00 |
| Nonylphenol Ethoxylates | 0.00 |
