Aerial view of pollution being emitted from steel factories in Hancheng, Shaanxi, China
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How deadly is air pollution?
Air pollution increases the risk of heart disease, strokes and lung cancer, causing millions of deaths every year.
01:07 - Source: CNN
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Aerial view of pollution being emitted from steel factories in Hancheng, Shaanxi, China
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An Indian army soldier stands guard during a curfew in Jammu on February 18, 2019. - Indian authorities withdrew police protection for five separatist leaders in Kashmir on February 17 amid mounting fallout from a suicide bombing that killed 41 soldiers in the disputed region. New Delhi has vowed to retaliate after a van packed with explosives ripped through a convoy transporting 2,500 soldiers across the Indian-administered territory on February 14, the deadliest-ever attack in a 30-year-old armed conflict. (Photo by Rakesh BAKSHI / AFP) (Photo credit should read RAKESH BAKSHI/AFP/Getty Images)
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ULSAN, SOUTH KOREA - MARCH 16: The power plant of SK Corporation oil refiner on March 16, 2006 in Ulsan, South Korea. The SK Corporation is Asia's leading energy and petrochemical company and South Korea's leading refiner, the fourth largest refiner in Asia and is also the World's second largest single complex oil refinery. Founded in 1962 as South Korea's first oil refiner. (Photo by Chung Sung-Jun/Getty Images)
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