Air pollution from China, India and several other Asian countries has wafted across the Pacific Ocean over the past 25 years, increasing levels of smog in the western U.S., a study finds…..
The smog levels in the western U.S. have increased each year despite a 50% reduction in U.S. emissions of smog-forming pollutants.
“Twenty years ago, scientists first speculated that rising Asian emissions would one day offset some of the United States’ domestic ozone reductions,” said Owen Cooper, a senior research scientist at the University of Colorado and NOAA, who was not directly involved in the study. Now that prediction has come true, he said.
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