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The air quality in the United States has improved since the passage of the Clean Air Act in 1970; however, it still poses a threat to human health. In 2005, the Environmental Protection Agency (EPA) estimated that over 122 million Americans live in areas with poor to marginal outdoor air quality.
In the United States, air quality is regulated by the EPA under the authority given by Congress in the Clean Air Act. The EPA establishes and monitors health-based standards for six criteria pollutants: carbon monoxide, lead, nitrogen oxide, ozone, particulate matter, and sulfur dioxide. These pollutants are chosen not only because they are highly prevalent, but also because they cause the most adverse effects on public health (NHDES, 2006)...
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