Los Angeles air pollution - and its infamous eye sting - have declined due to California's strict vehicle emission controls, scientists have said. Despite a three-fold rise in the number of vehicles on southern California roads since 1960, air pollution there has decreased, a study found. via Pocket http://www.bbc.co.uk/news/world-us-canada-22772933#sa-ns_mchannel=rss&ns_source=PublicRSS20-sa
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