air pollution n.
Contamination of air by smoke and harmful gases, mainly oxides of carbon, sulfur, and nitrogen.
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| an extraordinary or unusual thing, person, or event; an exceptional example or instance. |
| a screen or mat covered with a dark material for shielding a camera lens from excess light or glare. |
The addition of harmful chemicals to the atmosphere. The most serious air pollution results from the burning of fossil fuels, expecially in internal-combustion engines.