| Fossil-fuel fired steam electric plants of more than 250 million British thermal units per hour heat input, | Coke oven batteries, |
| Coal cleaning plants (thermal dryers), | Sulfur recovery plants, |
| Kraft pulp mills, | Carbon black plants (furnace process), |
| Portland cement plants, | Primary lead smelters, |
| Primary zinc smelters, | Fuel conversion plants, |
| Iron and steel mill plants, | Sintering plants, |
| Primary aluminum ore reduction plants, | Secondary metal production facilities, |
| Primary copper smelters, | Chemical process plants, |
| Municipal incinerators capable of charging more than 250 tons of refuse per day, | Fossil-fuel boilers of more than 250 million British thermal units per hour heat input, |
| Hydrofluoric, sulfuric, and nitric acid plants, | Petroleum storage and transfer facilities with a capacity exceeding 300,000 barrels, |
| Petroleum refineries, | Taconite ore processing facilities, |
| Lime plants, | Glass fiber processing plants, and |
| Phosphate rock processing plants, | Charcoal production facilities. |