Air Pollution | Poor Air Quality Threatens Human Health
Since the implementation of the 1990 amendments to the Clean Air Act, there has been a significant reduction of air pollution in the United States; however, despite this reduction, poor air quality continues to be a serious public health hazard. Fine particulate matter poses the greatest health risk, causing respiratory and cardiovascular damage. In many U.S. counties, fine particulate levels continue to exceed health standards. Levels of ozone, another harmful air pollutant, also exceed health standards in many areas. Power plants and nonroad diesel engines are two of the...
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