|  |  |  |  |  |  |  |  |  |  | Split * | 
| AK STEEL CORP | MIDDLETOWN | OH | Chromium and chromium compounds | 401 | 0 | 61,081 | 21.09% | 22.0% | 19.7% |  | 
| AK STEEL CORP | MIDDLETOWN | OH | Benzene | 23,557 | 0 | 41,300 | 14.26% | 20.7% | 20.1% |  | 
| AK STEEL CORP | MIDDLETOWN | OH | Nickel and nickel compounds | 277 | 0 | 32,300 | 11.15% | 22.1% | 19.6% |  | 
| MOUNTAIN STATE CARBON LLC | FOLLANSBEE | WV | Benzene | 38,000 | 2 | 30,852 | 10.65% | 24.9% | 19.5% |  | 
| AK STEEL CORP MANSFIELD WO RKS | MANSFIELD | OH | Chromium and chromium compounds | 1,100 | 0 | 29,729 | 10.26% | 19.6% | 25.0% |  | 
| AK STEEL DEARBORN WORKS | DEARBORN | MI | Chromium and chromium compounds | 208 | 0 | 16,258 | 5.61% | 30.1% | 46.4% |  | 
| AK STEEL CORPORATION--BUTLER WORKS | BUTLER | PA | Chromium and chromium compounds | 312 | 0 | 10,786 | 3.72% | 10.9% | 6.7% |  | 
| AK TUBE WALBRIDGE | WALBRIDGE | OH | Chromium and chromium compounds | 10 | 0 | 9,477 | 3.27% | 20.5% | 24.1% |  | 
| AK STEEL CORP | ASHLAND | KY | Chromium and chromium compounds | 223 | 0 | 8,380 | 2.89% | 28.5% | 8.8% |  | 
| AK STEEL CORP | MIDDLETOWN | OH | Polycyclic aromatic compounds | 174 | 0 | 8,006 | 2.76% | 27.9% | 19.0% |  | 
| AK STEEL DEARBORN WORKS | DEARBORN | MI | Nickel and nickel compounds | 170 | 0 | 6,666 | 2.30% | 27.0% | 46.3% |  | 
| AK STEEL CORP | MIDDLETOWN | OH | Manganese and manganese compounds | 4,706 | 0 | 6,258 | 2.16% | 21.9% | 19.7% |  | 
| AK TUBE LLC | COLUMBUS | IN | Chromium and chromium compounds | 21 | 0 | 4,902 | 1.69% | 14.1% | 15.9% |  | 
| AK STEEL CORP COSHOCTON WORKS | COSHOCTON | OH | Chromium and chromium compounds | 431 | 0 | 3,468 | 1.20% | 17.7% | 5.1% |  | 
| MOUNTAIN STATE CARBON LLC | FOLLANSBEE | WV | Polycyclic aromatic compounds | 183 | 6,700 | 3,031 | 1.05% | 28.3% | 23.0% |  | 
| AK STEEL DEARBORN WORKS | DEARBORN | MI | Manganese and manganese compounds | 1,275 | 0 | 2,834 | 0.98% | 34.6% | 46.5% |  | 
| AK STEEL CORPORATION--BUTLER WORKS | BUTLER | PA | Nickel and nickel compounds | 106 | 0 | 2,348 | 0.81% | 11.1% | 7.0% |  | 
| AK STEEL CORP | MIDDLETOWN | OH | Lead and lead compounds | 1,118 | 0 | 1,434 | 0.49% | 20.1% | 20.3% |  | 
| AK STEEL DEARBORN WORKS | DEARBORN | MI | Lead and lead compounds | 435 | 0 | 1,415 | 0.49% | 34.0% | 46.4% |  | 
| AK STEEL CORP | MIDDLETOWN | OH | Naphthalene | 1,106 | 0 | 1,369 | 0.47% | 23.8% | 19.3% |  | 
| AK STEEL DEARBORN WORKS | DEARBORN | MI | Formaldehyde | 463 | 0 | 1,277 | 0.44% | 30.8% | 46.6% |  | 
| MOUNTAIN STATE CARBON LLC | FOLLANSBEE | WV | Naphthalene | 3,410 | 6,690 | 1,216 | 0.42% | 26.3% | 20.8% |  | 
| AK STEEL CORP COSHOCTON WORKS | COSHOCTON | OH | Nickel and nickel compounds | 192 | 0 | 1,129 | 0.39% | 17.7% | 5.1% |  | 
| AK STEEL CORP | MIDDLETOWN | OH | Mercury and mercury compounds | 348 | 0 | 488 | 0.17% | 21.9% | 19.7% |  | 
| MOUNTAIN STATE CARBON LLC | FOLLANSBEE | WV | Cyanide compounds | 2,800 | 0 | 408 | 0.14% | 25.2% | 19.8% |  | 
| AK STEEL CORP MANSFIELD WO RKS | MANSFIELD | OH | Nickel and nickel compounds | 21 | 0 | 400 | 0.14% | 19.5% | 24.6% |  | 
| AK STEEL CORP | ASHLAND | KY | Lead and lead compounds | 629 | 0 | 399 | 0.14% | 28.4% | 8.7% |  | 
| MOUNTAIN STATE CARBON LLC | FOLLANSBEE | WV | Benzo(g,h,i)perylene | 500 | 438 | 263 | 0.09% | 28.2% | 22.8% |  | 
| AK STEEL CORP | ASHLAND | KY | Manganese and manganese compounds | 720 | 0 | 204 | 0.07% | 28.1% | 8.6% |  | 
| AK STEEL CORPORATION--BUTLER WORKS | BUTLER | PA | Manganese and manganese compounds | 563 | 0 | 195 | 0.07% | 10.7% | 6.5% |  | 
| AK STEEL DEARBORN WORKS | DEARBORN | MI | Zinc and zinc compounds | 8,833 | 0 | 182 | 0.06% | 34.9% | 46.5% |  | 
| AK TUBE WALBRIDGE | WALBRIDGE | OH | Nickel and nickel compounds | 3 | 0 | 173 | 0.06% | 21.2% | 25.4% |  | 
| AK STEEL CORP - ZANESVI LLE WORKS | ZANESVILLE | OH | Nickel and nickel compounds | 1 | 0 | 148 | 0.05% | 23.0% | 11.0% |  | 
| MOUNTAIN STATE CARBON LLC | FOLLANSBEE | WV | Hydrogen sulfide | 4,000 | 0 | 139 | 0.05% | 23.3% | 18.0% |  | 
| AK STEEL CORP - ZANESVI LLE WORKS | ZANESVILLE | OH | Nitric acid | 13,456 | 0 | 136 | 0.05% | 21.4% | 10.5% |  | 
| AK STEEL CORP | MIDDLETOWN | OH | Aluminum (fume or dust) | 1,809 | 0 | 134 | 0.05% | 21.8% | 19.7% |  | 
| AK STEEL CORP - ZANESVI LLE WORKS | ZANESVILLE | OH | Hydrogen fluoride | 7,450 | 0 | 102 | 0.04% | 22.1% | 10.7% |  | 
| AK STEEL CORP - ZANESVI LLE WORKS | ZANESVILLE | OH | Chromium and chromium compounds | 2 | 0 | 100 | 0.03% | 21.2% | 10.4% |  | 
| AK STEEL CORP MANSFIELD WO RKS | MANSFIELD | OH | Manganese and manganese compounds | 304 | 0 | 77 | 0.03% | 19.6% | 25.0% |  | 
| AK STEEL CORP MANSFIELD WO RKS | MANSFIELD | OH | Lead and lead compounds | 154 | 0 | 75 | 0.03% | 19.6% | 25.1% |  | 
| AK STEEL CORP - ZANESVI LLE WORKS | ZANESVILLE | OH | Glycol Ethers | 10,600 | 0 | 62 | 0.02% | 21.4% | 10.7% |  | 
| AK STEEL CORPORATION--BUTLER WORKS | BUTLER | PA | Hydrogen fluoride | 13,761 | 0 | 58 | 0.02% | 12.0% | 8.3% |  | 
| AK STEEL CORP | MIDDLETOWN | OH | Hydrochloric acid | 9,815 | 0 | 46 | 0.02% | 15.6% | 21.8% |  | 
| AK TUBE LLC | COLUMBUS | IN | Nickel and nickel compounds | 3 | 0 | 44 | 0.02% | 14.1% | 15.9% |  | 
| AK STEEL CORP | MIDDLETOWN | OH | Zinc and zinc compounds | 4,115 | 0 | 43 | 0.01% | 21.7% | 19.7% |  | 
| AK STEEL CORP COSHOCTON WORKS | COSHOCTON | OH | Nitric acid | 17,350 | 0 | 30 | 0.01% | 17.7% | 5.1% |  | 
| AK STEEL CORPORATION--BUTLER WORKS | BUTLER | PA | Lead and lead compounds | 39 | 0 | 27 | 0.01% | 10.7% | 6.5% |  | 
| AK STEEL CORP | ASHLAND | KY | Zinc and zinc compounds | 8,842 | 0 | 25 | 0.01% | 28.4% | 8.7% |  | 
| AK STEEL CORPORATION--BUTLER WORKS | BUTLER | PA | Molybdenum trioxide | 66 | 0 | 23 | 0.01% | 11.1% | 7.1% |  | 
| AK STEEL DEARBORN WORKS | DEARBORN | MI | Mercury and mercury compounds | 38 | 0 | 19 | 0.01% | 27.1% | 46.3% |  | 
| AK STEEL CORPORATION--BUTLER WORKS | BUTLER | PA | Zinc and zinc compounds | 5,617 | 0 | 17 | 0.01% | 10.7% | 6.5% |  | 
| AK STEEL CORP | MIDDLETOWN | OH | Ammonia | 6,851 | 0 | 16 | 0.01% | 20.8% | 20.0% |  | 
| AK STEEL DEARBORN WORKS | DEARBORN | MI | Copper and copper compounds | 37 | 0 | 15 | 0.01% | 36.1% | 46.6% |  | 
| MOUNTAIN STATE CARBON LLC | FOLLANSBEE | WV | Ammonia | 11,500 | 0 | 13 | 0.00% | 25.2% | 19.8% |  | 
| MOUNTAIN STATE CARBON LLC | FOLLANSBEE | WV | Lead and lead compounds | 16 | 0 | 12 | 0.00% | 25.1% | 19.7% |  | 
| AK STEEL CORP (ROCKPORT WORKS ) | ROCKPORT | IN | Chromium and chromium compounds | 1 | 0 | 11 | 0.00% | 14.8% | 11.6% |  | 
| AK STEEL CORPORATION--BUTLER WORKS | BUTLER | PA | Hydrochloric acid | 3,537 | 0 | 11 | 0.00% | 12.0% | 8.3% |  | 
| AK STEEL CORP MANSFIELD WO RKS | MANSFIELD | OH | Zinc and zinc compounds | 4,500 | 0 | 9 | 0.00% | 19.6% | 25.0% |  | 
| AK STEEL DEARBORN WORKS | DEARBORN | MI | Hydrochloric acid | 1,407 | 0 | 9 | 0.00% | 25.4% | 46.3% |  | 
| AK STEEL CORP | ASHLAND | KY | Mercury and mercury compounds | 33 | 0 | 9 | 0.00% | 27.9% | 8.6% |  | 
| AK STEEL CORP COSHOCTON WORKS | COSHOCTON | OH | Hydrogen fluoride | 3,367 | 0 | 5 | 0.00% | 17.7% | 5.1% |  | 
| AK STEEL CORP | ASHLAND | KY | Aluminum (fume or dust) | 191 | 0 | 4 | 0.00% | 28.6% | 8.8% |  | 
| AK STEEL DEARBORN WORKS | DEARBORN | MI | Polycyclic aromatic compounds | 0 | 0 | 4 | 0.00% | 28.0% | 49.7% |  | 
| AK STEEL CORP COSHOCTON WORKS | COSHOCTON | OH | Manganese and manganese compounds | 47 | 0 | 4 | 0.00% | 17.7% | 5.1% |  | 
| AK STEEL CORP (ROCKPORT WORKS ) | ROCKPORT | IN | Ammonia | 8,960 | 0 | 3 | 0.00% | 14.8% | 11.6% |  | 
| AK STEEL CORP (ROCKPORT WORKS ) | ROCKPORT | IN | Hydrogen fluoride | 1,120 | 0 | 2 | 0.00% | 14.8% | 11.6% |  | 
| AK STEEL CORP | MIDDLETOWN | OH | Phenol | 2,814 | 0 | 2 | 0.00% | 21.7% | 20.0% |  | 
| AK STEEL CORPORATION--BUTLER WORKS | BUTLER | PA | Mercury and mercury compounds | 14 | 0 | 2 | 0.00% | 13.2% | 10.0% |  | 
| AK STEEL CORPORATION--BUTLER WORKS | BUTLER | PA | Copper and copper compounds | 55 | 0 | 2 | 0.00% | 10.8% | 6.6% |  | 
| AK STEEL CORP MANSFIELD WO RKS | MANSFIELD | OH | Copper and copper compounds | 56 | 0 | 2 | 0.00% | 19.7% | 25.3% |  | 
| MOUNTAIN STATE CARBON LLC | FOLLANSBEE | WV | Phenol | 2,780 | 104 | 1 | 0.00% | 26.6% | 21.1% |  | 
| MOUNTAIN STATE CARBON LLC | FOLLANSBEE | WV | Mercury and mercury compounds | 12 | 0 | 1 | 0.00% | 14.9% | 10.0% |  | 
| AK STEEL CORP (ROCKPORT WORKS ) | ROCKPORT | IN | Nitric acid | 460 | 0 | 1 | 0.00% | 14.8% | 11.6% |  | 
| AK STEEL CORP | ASHLAND | KY | Ammonia | 750 | 0 | 1 | 0.00% | 28.7% | 8.9% |  | 
| MOUNTAIN STATE CARBON LLC | FOLLANSBEE | WV | Xylene (mixed isomers) | 1,630 | 3 | 1 | 0.00% | 20.7% | 15.4% |  | 
| AK TUBE WALBRIDGE | WALBRIDGE | OH | Zinc and zinc compounds | 112 | 0 | 1 | 0.00% | 21.2% | 25.4% |  | 
| AK STEEL CORP - ZANESVI LLE WORKS | ZANESVILLE | OH | Lead and lead compounds | 0 | 0 | 1 | 0.00% | 23.0% | 11.0% |  | 
| MOUNTAIN STATE CARBON LLC | FOLLANSBEE | WV | Ethylene | 41,000 | 0 | 1 | 0.00% | 24.6% | 19.2% |  | 
| AK STEEL CORP COSHOCTON WORKS | COSHOCTON | OH | Lead and lead compounds | 0 | 0 | 0 | 0.00% | 17.7% | 4.5% |  | 
| AK STEEL CORP - ZANESVI LLE WORKS | ZANESVILLE | OH | Mercury and mercury compounds | 0 | 0 | 0 | 0.00% | 23.0% | 11.0% |  | 
| AK STEEL CORP | MIDDLETOWN | OH | Ethylene | 1,999 | 0 | 0 | 0.00% | 23.0% | 19.4% |  | 
| AK STEEL CORP | MIDDLETOWN | OH | Toluene | 3,919 | 0 | 0 | 0.00% | 17.4% | 21.2% |  | 
| MOUNTAIN STATE CARBON LLC | FOLLANSBEE | WV | Toluene | 7,800 | 2 | 0 | 0.00% | 18.2% | 13.1% |  | 
| AK STEEL CORP COSHOCTON WORKS | COSHOCTON | OH | Mercury and mercury compounds | 0 | 0 | 0 | 0.00% | 17.7% | 4.5% |  | 
| AK STEEL CORPORATION--BUTLER WORKS | BUTLER | PA | Vanadium and vanadium compounds | 10 | 0 | 0 | 0.00% | 10.7% | 6.4% |  | 
| AK STEEL CORP MANSFIELD WO RKS | MANSFIELD | OH | Mercury and mercury compounds | 0 | 0 | 0 | 0.00% | 19.6% | 25.0% |  | 
| MOUNTAIN STATE CARBON LLC | FOLLANSBEE | WV | Anthracene | 65 | 705 | 0 | 0.00% | 27.3% | 21.8% |  | 
| MOUNTAIN STATE CARBON LLC | FOLLANSBEE | WV | Styrene | 39 | 0 | 0 | 0.00% | 27.7% | 22.2% |  | 
| AK STEEL CORP | MIDDLETOWN | OH | Anthracene | 4 | 0 | 0 | 0.00% | 22.1% | 19.9% |  | 
| MOUNTAIN STATE CARBON LLC | FOLLANSBEE | WV | Cresol (mixed isomers) | 1 | 150 | 0 | 0.00% | 27.3% | 21.8% |  | 
| MOUNTAIN STATE CARBON LLC | FOLLANSBEE | WV | Phenanthrene | 960 | 3,690 | 0 | 0.00% | 0.0% | 0.0% |  | 
| MOUNTAIN STATE CARBON LLC | FOLLANSBEE | WV | Dibenzofuran | 170 | 770 | 0 | 0.00% | 0.0% | 0.0% |  | 
| AK STEEL CORP | MIDDLETOWN | OH | Phenanthrene | 416 | 0 | 0 | 0.00% | 0.0% | 0.0% |  |