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Los Angeles air pollution drops after tailpipe laws (BBC)
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.
That includes peroxyacetyl nitrate, known to irritate the eyes, the US government study found.
The study "confirms" vehicle regulations worked, its author said.
"LA's air has lost a lot of its 'sting,'" said lead author Ilana Pollack of the National Oceanic and Atmospheric Association's research centre at the University of Colorado Boulder.
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more: http://www.bbc.co.uk/news/world-us-canada-22772933
