Monday, January 30, 2012

The 10 Most Air-Polluted Cities in the U.S.

The World Health Organization has ranked cities around the world on their amount of particulate pollution in the air. Here's the dirtiest of the dirty in the U.S.

10. Pittsburgh/San Diego

During its industrial heyday, Pittsburgh was an environmental catastrophe, a steel-mill city where the soot was visible on residents' windowsills. Over the years, Pittsburgh has gone from a city of steel workers to one of middle managers — though, thankfully, the Steelers haven't gone away — and the air has improved. But pollution is still a major problem — an estimated 47,000 children in the greater Pittsburgh area suffer from asthma.

Meanwhile, most Americans probably think of San Diego as a Southern California paradise. But heavy traffic on its highways — as well as localized pollution from the city's busy port — can turn the air brown, especially during rush hour. San Diego averages nearly 30 days of unhealthy ozone levels each year — though like Pittsburgh, its air has improved in recent years. Read More