| Chromium | 156.98 |
| Cobalt | 116.84 |
| 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.) | 67.08 |
| Ethylene oxide | 51.07 |
| Trichloroethylene | 13.63 |
| Nickel | 12.38 |
| Lead | 6.97 |
| Nickel compounds | 6.16 |
| Chloroform | 3.42 |
| Diisocyanates | 3.24 |
| Benzene | 1.19 |
| Antimony compounds | 0.61 |
| Formaldehyde | 0.58 |
| o-Xylene | 0.53 |
| Zinc compounds | 0.49 |
| Maleic anhydride | 0.48 |
| Di(2-ethylhexyl) phthalate | 0.44 |
| Polycyclic aromatic compounds | 0.29 |
| Dicyclopentadiene | 0.25 |
| Naphthalene | 0.06 |
| Hydrogen fluoride (Hydrofluoric acid) | 0.06 |
| Acrylonitrile | 0.05 |
| Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 0.05 |
| Toluene diisocyanate (mixed isomers) | 0.05 |
| Copper | 0.05 |
| Dichloromethane (Methylene chloride) | 0.05 |
| N,N-Dimethylformamide | 0.05 |
| Peracetic acid | 0.04 |
| Ethylbenzene | 0.04 |
| Hydrogen cyanide | 0.04 |
| Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 0.03 |
| Nitric acid | 0.03 |
| Xylene (mixed isomers) | 0.03 |
| Triethylamine | 0.03 |
| Lead compounds | 0.02 |
| Certain glycol ethers | 0.02 |
| Toluene | 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 |
| Acetonitrile | 0.01 |
| Pyridine | 0.01 |
| n-Hexane (Hexane) | 0.01 |
| Butyl acrylate | 0.00 |
| Ethylene glycol | 0.00 |
| Methyl tert-butyl ether | 0.00 |
| Barium compounds (except for barium sulfate (CAS No. 7727-43-7)) | 0.00 |
| Silver compounds | 0.00 |
| Aluminum (fume or dust) | 0.00 |
| Toluene-2,4-diisocyanate | 0.00 |
| Phenol | 0.00 |
| 1,2,4-Trimethylbenzene | 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 |
| Phthalic anhydride | 0.00 |
| Manganese | 0.00 |
| Methanol | 0.00 |
| Styrene | 0.00 |
| Methyl methacrylate | 0.00 |
| Acrylic acid | 0.00 |
| Mercury | 0.00 |
| Ethyl acrylate | 0.00 |
| Benzo[g,h,i]perylene | 0.00 |
| Cyclohexane | 0.00 |
| n-Butyl alcohol (1-Butanol) | 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 |
| Acetophenone | 0.00 |
| Nitrate compounds (water dissociable; reportable only when in aqueous solution) | 0.00 |
| Cyanide compounds | 0.00 |
| Benzoyl peroxide | 0.00 |
| Lithium carbonate | 0.00 |
| N-Methyl-2-pyrrolidone | 0.00 |
| Tetrabromobisphenol A | 0.00 |
| Nonylphenol Ethoxylates | 0.00 |
