China's air pollution crisis

Pollution from China travels in large quantities across the Pacific Ocean to the United States, a new study has found, making environmental and health problems unexpected side effects of U.S. demand for cheap China-manufactured goods.

On some days, acid rain-inducing sulphate from burning of fossil fuels in China can account for as much as a quarter of sulphate pollution in the western United States, a team of Chinese and American researchers said in the report published by

the U.S. National Academy of Sciences, a non-profit society of scholars. (REUTERS)

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A woman wearing a mask walk through a street covered by dense smog in Harbin, northern China, Monday, Oct. 21, 2013. Visibility shrank to less than half a football field and small-particle pollution soared to a record 40 times higher than an international safety standard in one northern Chinese city as the region entered its high-smog season. (AP Photo/Kyodo News) JAPAN OUT, CREDIT MANDATORY

A golfer plays on the court on a hazy day at Pine Valley Golf Club on the outskirts of Beijing, China, Sunday, Oct. 6, 2013. Fog and pollution descended on northern China on Sunday, forcing international golf and tennis players to play in hazardous smog and leading to flight cancellations and road closures as millions of Chinese headed home from a national holiday. (AP Photo/Alexander F. Yuan)

A traffic policeman signals to drivers during a smoggy day in Harbin

A traffic policeman signals to drivers during a smoggy day in Harbin, Heilongjiang province, October 21, 2013. The second day of heavy smog with a PM 2.5 index has forced the closure of schools and highways, exceeding 500 micrograms per cubic meter on Monday morning in downtown Harbin, according to Xinhua News Agency. REUTERS/China Daily (CHINA - Tags: ENVIRONMENT TRANSPORT) CHINA OUT. NO COMMERCIAL OR EDITORIAL SALES IN CHINA

People ride along a street on a smoggy day in Daqing

People ride along a street on a smoggy day in Daqing, Heilongjiang province, October 21, 2013. The highest red alert was issued for heavy smog in several cities in Heilongjiang province on Monday, according to Xinhua News Agency. The second day of heavy smog with a PM 2.5 index has forced the closure of schools and highways, exceeding 500 micrograms per cubic meter on Monday morning in downtown Harbin, the provincial capital. REUTERS/Stringer (CHINA - Tags: ENVIRONMENT SOCIETY) CHINA OUT. NO COMMERCIAL OR EDITORIAL SALES IN CHINA

Germany's Sandra Gal, wearing a mask, gestures on the third green on a hazy day during the final round of the Reignwood LPGA Classic golf tournament at Pine Valley Golf Club on the outskirts of Beijing, China, Sunday, Oct. 6, 2013. Fog and pollution descended on northern China on Sunday, forcing international golf and tennis players to play in hazardous smog and leading to flight cancellations and road closures as millions of Chinese headed home from a national holiday. (AP Photo/Alexander F. Yuan)

A man wears a mask on Tiananmen Square in thick haze in Beijing Tuesday, Jan. 29, 2013. Extremely high pollution levels shrouded eastern China for the second time in about two weeks Tuesday, forcing airlines in Beijing and elsewhere to cancel flights because of poor visibility and prompting government warnings for residents to stay indoors. (AP Photo/Ng Han Guan)

A man wearing a mask walks on a stone bridge in a park on a hazy day in Beijing, China, Monday, Jan. 14, 2013. Beijing schools kept children indoors and hospitals saw a spike in respiratory cases Monday following a weekend of off-the charts pollution in China's smoggy capital, the worst since the government began being more open about air-quality data. (AP Photo/Alexander F. Yuan)

People visit a park near the Military Museum, seen in background, on a hazy day in Beijing, China, Monday, Jan. 14, 2013. Beijing schools kept children indoors and hospitals saw a spike in respiratory cases Monday following a weekend of off-the charts pollution in China's smoggy capital, the worst since the government began being more open about air-quality data. (AP Photo/Alexander F. Yuan)

A man walks on an frozen lake on a hazy day in Beijing, China, Monday, Jan. 14, 2013. Beijing schools kept children indoors and hospitals saw a spike in respiratory cases Monday following a weekend of off-the charts pollution in China's smoggy capital, the worst since the government began being more open about air-quality data. (AP Photo/Alexander F. Yuan)

A woman wears a mask while walking in a park near the China Central Television Tower, background, on a hazy day in Beijing, China, Monday, Jan. 14, 2013. Beijing schools kept children indoors and hospitals saw a spike in respiratory cases Monday following a weekend of off-the charts pollution in China's smoggy capital, the worst since the government began being more open about air-quality data. (AP Photo/Alexander F. Yuan)

Skyscrapers are obscure by heavy haze in Beijing Sunday, Jan. 13, 2013. People refused to venture outdoors and buildings disappeared into Beijing's murky skyline on Sunday as the capital's air quality went off the index. (AP Photo/Ng Han Guan)

Visitors gather near an entrance to the Forbidden city during a very hazy day in Beijing Sunday, Jan. 13, 2013. People refused to venture outdoors and buildings disappeared into Beijing's murky skyline on Sunday as the capital's air quality went off the index. (AP Photo/Ng Han Guan)

A woman wears a mask as she visits Tiananmen Square in Beijing Sunday, Jan. 13, 2013. People refused to venture outdoors and buildings disappeared into Beijing's murky skyline on Sunday as the capital's air quality went off the index. (AP Photo/Ng Han Guan)

China air pollution

China air pollution