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

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 pollution, year-round particle pollution and ozone pollution—over the period of 2004-2006. For the first time a city outside of California has topped one of the American Lung Association's rankings; Pittsburgh moved to the top of the list of cities most polluted by short-term levels of particle pollution...

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