ストックフォト: 鋼 · ミル · 毒性 · 煙突 · 空気 · アップ / Steel mill smelter emitting toxic fumes and air pollutants billowing up and out of one of its many tall chimneys. Pollutants can vary and include hydrogen fluoride, sulfur dioxide, oxides of nitrogen, offensive and noxious smoke fumes, vapors, gases, and
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