26.04.2012 - US: 10 most polluted cities
The U.S. has significantly reduced its air pollution, but there's still a lot of work to be done. These 10 cities had the highest levels of year-round particle pollution, according to the American Lung Association's 2012 rankings. Bakersfield sits in a bowl surrounded on three sides by the Sierras and the California coastal ranges. Air drifts down the valley from other cities and lingers, allowing pollutants to build up, according to Jaime Holt, chief communications officer for the San Joaquin Valley Air Quality District. Making matters worse, the sun bakes the air, causing photochemical smog. And the dry weather adds dust particles to the mix...............................................Full Article: Source
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