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by Katie Machol
Air quality across the United States has improved dramatically since 1970 when Congress passed the Clean Air Act. Nonetheless, some 175 million Americans - 58 percent of the population - still live in places where pollution levels can cause breathing difficulties or worse.
- Tags: Green Policy, EPA, Green Policy, clean air act, air pollution, pollution, American Lung Association, air quality, life expectancy, state of the air 2010