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America's Most Polluted Cities

Cleanest and Dirtiest Cities of 2011

Cleanest and Dirtiest Cities of 2011

Half of the nation lives in areas where air pollution levels are often dangerous to breathe, according to the American Lung Association's 2011 State of the Air report, which ranked the worst and best U.S. cities in terms of air pollution based on levels of ozone pollution, short-term particle pollution and year-long particle pollution. Air pollution can contribute to health issues like allergies, asthma, chronic bronchitis, chronic obstructive pulmonary disease (COPD) and many other respiratory illnesses. Is your area in the clear? Read on to find out.

By MedHelp Editors, published May 3, 2011