China Pollution Crosses Sea to Hamper Air Cleanup Effort in U.S.

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Chinese air pollution is blowing across the Pacific Ocean and partly offsetting clean air measures taken in California, according to Dutch and U.S. researchers.

More than two-fifths of the expected benefits of anti-pollution controls in the western U.S. were canceled out by rising ozone pollution from China, scientists led by Willem Verstraeten at Wageningen University in the Netherlands said Monday in the journal Nature Geoscience.