http://www.huffingtonpost.com/2013/04/24/state-of-the-air-2013_n_3140946.html?utm_hp_ref=green
This article talked about how Americans are still live with very poor air quality.
Over 40 percent of Americans live in counties with terrible air quality. California
has the worst air quality, and it is throughout the whole state. In the United States,
131.8 million people live in a place with poor air quality. Reducing coal burning
power plants and cleaner diesel fuel has helped air quality, but there is still a long
way to go.
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