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| POLLUTANTS | MAJOR SOURCES | COMMENTS |
| Carbon Monoxide | Motor-vehicle exhaust; some industrial processes | Health standard: 10 mg/m3 (9 ppm) over 8 hr; 40 mg/m3 over 1 hr (35 ppm) |
| Sulphur Dioxide | Heat and power generation facilities that use oil or coal containing sulfur; sulfuric acid plants | Health standard: 80 µg/m3 (0.03 ppm) over a year; 365 µg/m3 over 24 hr (0.14 ppm |
| Particulate Matter | Motor-vehicle exhaust; industrial processes; refuse incineration; heat and power generation; reaction of pollution gases in the atmosphere | Health standard: 50 µg/m3 over a year; 150 µg/m3 over 24 hr; composed of carbon, nitrates, sulfates, and many metals including lead, copper, iron, and zinc |
| Lead | Motor-vehicle exhaust; lead smelters; battery plants | Health standard: 1.5 µg/m3 over 3 months |
| Nitrogen Dioxide | Motor-vehicle exhaust; heat and power generation; nitric acid; explosives; fertilizer plants | Health standard: 100 µg/m3 (0.05 ppm) over a year; reacts with hydrocarbons and sunlight to form photochemical oxidants |
| Ozone | Formed in the atmosphere by reaction of nitrogen oxides, hydrocarbons, and sunlight | Health standard: 235 µg/m3 (0.12 ppm) over 1 hr |