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EnviroTech :: Environment

Houston, Los Angeles, and Pittsburgh Among Top 5 Most Polluted U.S. Cities

11:02 AM MDT | May 1, 2008 | Michelle Bryner

The top five most polluted U.S. cities include Houston, Los Angeles, and Pittsburgh, according to a study released today by the American Lung Association (Washington), which ranked cities most affected by three types of pollution—short-term particle...

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