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US air cleaner but 50% of Americans breathe dirty air still (Earth Times) (1 Viewer)

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The American Lung Association's State of the Air 2011 report released April 27 says that ''the majority of American cities most-polluted by ozone (smog) or year-round particle pollution (soot) have improved,'' during 2007-2009. The report covers three measures: ozone, short term particle (solid and liquid) levels and year-round particle levels.

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