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Consequences of breathing dirty air include increased probability of heart attacks, respiratory diseases, and lung cancer.
Plants are sensitive to pollutants
In the early days of industrialization, fumes from furnaces, smelters, refineries, and chemical plants often destroyed vegetation and created desolate, barren landscapes around mining and manufacturing centers.
Synergistic effects in which the injury caused by exposure to two factors together is more than the sum of exposure to each factor individually.