| Chromium | 138.53 |
| Cobalt | 110.81 |
| Lead | 51.11 |
| Hydrazine | 40.39 |
| Ethylene oxide | 16.56 |
| Trichloroethylene | 11.63 |
| Nickel | 9.06 |
| Nickel compounds | 5.14 |
| Chloroform | 3.62 |
| Zinc compounds | 3.58 |
| Diisocyanates | 3.12 |
| Hydrogen cyanide | 1.90 |
| Benzene | 1.40 |
| N,N-Dimethylformamide | 1.18 |
| Polycyclic aromatic compounds | 1.00 |
| Toluene diisocyanate (mixed isomers) | 0.99 |
| 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.) | 0.82 |
| Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 0.54 |
| Di(2-ethylhexyl) phthalate | 0.42 |
| Formaldehyde | 0.34 |
| Antimony compounds | 0.28 |
| Toluene | 0.27 |
| Maleic anhydride | 0.24 |
| Copper | 0.18 |
| Lead compounds | 0.14 |
| Dicyclopentadiene | 0.09 |
| Naphthalene | 0.08 |
| Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 0.05 |
| Triethylamine | 0.05 |
| n-Hexane (Hexane) | 0.04 |
| Ethylbenzene | 0.04 |
| Acrylonitrile | 0.02 |
| Dichloromethane (Methylene chloride) | 0.02 |
| Xylene (mixed isomers) | 0.02 |
| Peracetic acid | 0.02 |
| Nitric acid | 0.01 |
| Ethylene glycol | 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 |
| Certain glycol ethers | 0.01 |
| o-Xylene | 0.00 |
| Toluene-2,4-diisocyanate | 0.00 |
| 1,2,4-Trimethylbenzene | 0.00 |
| Silver compounds | 0.00 |
| Butyl acrylate | 0.00 |
| Methanol | 0.00 |
| Manganese | 0.00 |
| Methyl tert-butyl ether | 0.00 |
| Barium compounds (except for barium sulfate (CAS No. 7727-43-7)) | 0.00 |
| Acetonitrile | 0.00 |
| Phthalic anhydride | 0.00 |
| Methyl methacrylate | 0.00 |
| Benzo[g,h,i]perylene | 0.00 |
| Styrene | 0.00 |
| Cyclohexane | 0.00 |
| Acrylic acid | 0.00 |
| Ethyl acrylate | 0.00 |
| Sodium nitrite | 0.00 |
| n-Butyl alcohol (1-Butanol) | 0.00 |
| Methyl isobutyl ketone | 0.00 |
| Phenol | 0.00 |
| Formic acid | 0.00 |
| Acetophenone | 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 |
