The Air Quality Index (AQI) is a color-coded chart for reporting daily air quality. Each color tells you how clean or polluted your air is, and what associated health effects might be a concern for you. The AQI focuses on health effects you may experience within a few hours or days after breathing polluted air....
The Clean Air Act (CAA) was signed by President Richard Nixon on Dec. 31, 1970, to regulate air emissions from stationary and mobile sources. Before its passage, smog—a combination of ground-level ozone and particle pollution—posed a significant problem for many U.S. cities. Congress charged the newly formed Environmental Protection Agency (EPA) with the primary role...
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