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The Clean Air Act requires EPA to set NAAQS for six criteria pollutants, including particle pollution. The EPA is currently reviewing scientific evidence to determine whether that NAAQS should be revised in order to meet the 1997 Clean Air Act's goal of protecting human health with an adequate margin of safety. In 1997, recognizing that the standards it had set in the 1970s and 1980s were no longer sufficient to protect public health, EPA drafted new NAAQS for two of the most harmful and persistent criteria pollutants: soot and smog. |
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