"Only a decade ago did scientists in the University of California's Pacific Rim Aerosol Network help discover that the pollution crossing the Pacific from Asia was worse than suspected, with millions of tons of previously undetected contaminants carried on the wind.
In fact, on any spring or summer day, almost a third of the air high over Los Angeles, San Francisco and other California cities can be traced directly to Asia, researchers said.
'More stuff starting up over there means more stuff ending up over here,' said UC Davis atmospheric scientist Steven Cliff.
Usually, dust and industrial pollutants take from five days to two weeks to cross the Pacific to California."
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