China's Airpocalypse

A baby looks from inside a vehicle stranded on a highway between Beijing and Hebei province, China, that is closed due to smog on an extremely polluted day November 30, 2015. REUTERS/Damir Sagolj

Workers clean the exterior of skyscraper Shanghai Tower during a hazy day in Shanghai, China, November 30, 2015. REUTERS/Aly Song

A man plays with a kite on an extremely polluted day in Baoding, China November 30, 2015. Baoding, located in Hebei province neighbouring Beijing was the most polluted city in China in the first half of 2015, according to the country's Ministry of Environmental Protection. REUTERS/Damir Sagolj

A woman covers her mouth with her hair amid heavy smog in Beijing, China, November 30, 2015. REUTERS/Jason Lee

A woman sells hot food to a driver stranded on a highway between Beijing and Hebei province, China, that is closed due to smog on an extremely polluted day November 30, 2015. REUTERS/Damir Sagolj

A man wearing a mask makes his way at a business district during a heavily polluted day in Beijing, China November 30, 2015. REUTERS/Kim Kyung-Hoon

A woman is pushed in a wheelchair on an extremely polluted day in Baoding, China November 30, 2015. REUTERS/Damir Sagolj

A dog peers from inside a car stranded on a highway between Beijing and Hebei province, China, that is closed due to smog on an extremely polluted day November 30, 2015. REUTERS/Damir Sagolj

People talk behind a toll gate on a highway between Beijing and Hebei province, China that is closed due to smog on an extremely polluted day, November 30, 2015. REUTERS/Damir Sagolj

Boats pass along the Huangpu River next to the financial area of the Pudong New District amid heavy smog in Shanghai, China, November 30, 2015. REUTERS/Stringer

Paramilitary soldiers walk past the Zhengyangmen gate as they patrol at the Tiananmen Square during a heavily polluted day in Beijing, China November 30, 2015. REUTERS/Kim Kyung-Hoon

A woman wearing a mask cycles amid heavy smog in Beijing's Guomao area, China, November 30, 2015. REUTERS/Jason Lee

A woman wears a mask on a pedestrian overpass on a hazy day at the Pudong financial area in Shanghai, China, November 30, 2015. REUTERS/Aly Song

A woman cleans a glass panel on a residential building during a hazy day in Shanghai, China, November 30, 2015. REUTERS/Aly Song

The sun is seen through the smog from a highway between Beijing and Hebei province, China, that is closed on an extremely polluted day November 30, 2015. REUTERS/Damir Sagolj