| http://www.w3.org/ns/prov#value | - It says progress has been made in reducing particle pollution such as soot and dust, thanks to cleaner diesel engines and controls on coal-fired power plants.The Los Angeles area continued to have the nation's worst ozone pollution while Bakersfield had the worst short-term particle pollution.The Phoenix-Mesa-Scottsdale area of Arizona had the worst year-round particle pollution.The cleanest citie
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