| Dicyclopentadiene | 30.95 |
| Cobalt | 23.86 |
| Chromium | 23.21 |
| Ethylene oxide | 19.97 |
| Maleic anhydride | 12.54 |
| 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.) | 5.16 |
| Trichloroethylene | 4.40 |
| Nickel | 4.30 |
| Acrylonitrile | 1.36 |
| Peracetic acid | 1.01 |
| Antimony compounds | 0.45 |
| Diisocyanates | 0.15 |
| Butyl acrylate | 0.13 |
| Formaldehyde | 0.11 |
| Dichloromethane (Methylene chloride) | 0.07 |
| Polycyclic aromatic compounds | 0.06 |
| Phthalic anhydride | 0.05 |
| Lead | 0.04 |
| Styrene | 0.03 |
| Hydrogen cyanide | 0.01 |
| Hydrochloric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 0.01 |
| Nitric acid | 0.01 |
| Acetonitrile | 0.00 |
| Acrylic acid | 0.00 |
| Toluene | 0.00 |
| Lead compounds | 0.00 |
| Ethyl acrylate | 0.00 |
| Methyl methacrylate | 0.00 |
| Barium compounds (except for barium sulfate (CAS No. 7727-43-7)) | 0.00 |
| 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) | 0.00 |
| Toluene diisocyanate (mixed isomers) | 0.00 |
| Zinc compounds | 0.00 |
| Methyl tert-butyl ether | 0.00 |
| Copper | 0.00 |
| Ethylene glycol | 0.00 |
| Certain glycol ethers | 0.00 |
| Di(2-ethylhexyl) phthalate | 0.00 |
| Phenol | 0.00 |
| o-Xylene | 0.00 |
| Sulfuric acid (acid aerosols including mists, vapors, gas, fog, and other airborne forms of any particle size) | 0.00 |
| N,N-Dimethylformamide | 0.00 |
| n-Hexane (Hexane) | 0.00 |
| Xylene (mixed isomers) | 0.00 |
| Methanol | 0.00 |
| 1,2,4-Trimethylbenzene | 0.00 |
| Vinyl acetate | 0.00 |
| Benzo[g,h,i]perylene | 0.00 |
| Silver compounds | 0.00 |
| Manganese | 0.00 |
| Acetophenone | 0.00 |
| Formic acid | 0.00 |
| n-Butyl alcohol (1-Butanol) | 0.00 |
| Methyl isobutyl ketone | 0.00 |
| Cyanide compounds | 0.00 |
| Nitrate compounds (water dissociable; reportable only when in aqueous solution) | 0.00 |
| Lithium carbonate | 0.00 |
| N-Methyl-2-pyrrolidone | 0.00 |
| Tetrabromobisphenol A | 0.00 |
