china beijing smog big business rivers lklv_00005508.jpg
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Chinese consumers rush to buy anti-smog products
Beijing is once again under a "red alert" for smog, and it appears China's smog problem is now becoming big business. CNN's Matt Rives reports.
02:18 - Source: CNN
Smog in China 12 videos
china beijing smog big business rivers lklv_00005508.jpg
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Chinese consumers rush to buy anti-smog products
02:18
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China's smog seen from above
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Timelapse: Smog envelops Beijing in minutes
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A view of the Los Angeles city skyline as heavy smog shrouds the city in California on May 31, 2015. AFP PHOTO/ MARK RALSTON (Photo credit should read MARK RALSTON/AFP/Getty Images)
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What is in our air
01:15
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BEIJING, CHINA - DECEMBER 18: Tourists wearing masks visit the Tiananmen Square on December 18, 2016 in Beijing, China. At least 24 cities in North China issued red alerts on Friday as heavy smog will shroud the country's northern regions in the following two days. (Photo by VCG/VCG via Getty Images)
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Heavy smog causes chaos in China
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A plane grounded at the Chengdu Shuangliu International Airport in China by thick fog and smog from pollution.
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Students take test surrounded by smog
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Why is Beijing's smog so bad?
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BEIJING, CHINA - DECEMBER 18: Tourists wearing masks visit the Tiananmen Square on December 18, 2016 in Beijing, China. At least 24 cities in North China issued red alerts on Friday as heavy smog will shroud the country's northern regions in the following two days. (Photo by VCG/VCG via Getty Images)
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Smog strands over 20,000 at airport
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A woman wearing a face mask walks in heavy smog in Harbin, northeast China's Heilongjiang province, on October 21, 2013. Choking clouds of pollution blanketed Harbin, a Chinese city famed for its annual ice festival on October 21, reports said, cutting visibility to 10 metres (33 feet) and underscoring the nation's environmental challenges. CHINA OUT AFP PHOTO (Photo credit should read STR/AFP/Getty Images)
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China seizes faulty smog masks
04:23
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Smog cause hazardous air quality in Beijing
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Time-lapse video shows smog-stricken Beijing
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Is Beijing's smog 'red alert' helping air quality?
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