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When did air pollution become an environmental issue? What are some of the general effects of air pollution on the environment and human health? What are the main sources of air pollution? What are the major air pollutants? Where are air pollution problems most severe? What is smog? What trends are expected in urban air pollution? What can be done to reduce air pollution in urban areas? What is acid rain? What causes acid rain? What are the environmental effects of acid rain? How can acid rain and other air pollutants be controlled? What air pollution legislation was passed in the Clean Air Act Amendments of 1990? What are air quality standards? How much does air pollution prevention cost? Ecolinks On The Web
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