Throughout the world the damage cause by air pollution is enormous. In money alone it represents a loss of billions of dollars each year. Many flower and vegetable crops suffer ill effects from air pollution caused by exhaust gases. Trees have been killed by pollution. Cattle have been poisoned. Air pollution causes rubber tires on automobiles to crack and become porous. Fine buildings become shabby, their walls blackened with soot as a result of the pollution that has settled on building stones and surfaces for years.
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