- average urban air pollution level
- средний уровень загрязнения атмосферы по городам
Англо-русский словарь по экологии. 2011.
Англо-русский словарь по экологии. 2011.
Air pollution — from World War II production Smog over … Wikipedia
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Clean Air Act (United States) — Clean Air Act Full title Clean Air Act of 1963 Acronym CAA Effective Dec. 17, 1963 Citations Public Law P.L. 88 206 … Wikipedia