Jobseekers read papers containing jobs information during a job fair for college graduates at a exhibition centre in Beijing, China, December 5, 2015. (Photo by Reuters/Stringer)





A barber shaves the face of a customer at a makeshift barber shop beside a street in Shenyang, Liaoning province, China, December 4, 2015. (Photo by Sheng Li/Reuters)





A couple takes a selfie with a mobile phone during a visit to the West Lake amid snowfall in Hangzhou, Zhejiang province, China, December 5, 2015. (Photo by Reuters/Stringer)





A view shows some of the 50 pitches at Evergrande soccer academy in Qingyuan, southern China December 3, 2015. (Photo by Tyrone Siu/Reuters)





A man holds an umbrella to shield against snowfall as he rows a boat on the West Lake in Hangzhou, Zhejiang province, China, December 5, 2015. (Photo by Reuters/Stringer)





Residents do morning exercise next to a bridge on a hazy day in Beijing, China, December 7, 2015. (Photo by Jason Lee/Reuters)





Primary school students exercise inside a classroom as outdoor activities are banned due to heavy smog, in Beijing, China, December 7, 2015. (Photo by Reuters/Stringer)





People wearing protective masks walk through an overpass during the evening rush hour amid the heavy smog after Beijing issued its first red alert for air pollution in Beijing, China December 7, 2015. China's capital on Monday issued its first ever "red alert" for pollution, as the city government warned that Beijing would be shrouded in heavy smog from Tuesday until Thursday. (Photo by Jason Lee/Reuters)





Women wearing masks and other residents dance during their daily exercise amid the heavy smog in Beijing, China December 7, 2015. China's capital on Monday issued its first ever "red alert" for pollution, as the city government warned that Beijing would be shrouded in heavy smog from Tuesday until Thursday. (Photo by Jason Lee/Reuters)





A man cleans a solar panel installed on his rooftop for free by the government, in Bozhou, Anhui province, China, October 12, 2015. (Photo by Reuters/Stringer)





People wearing protective masks ride bicycles in the morning on an extremely polluted day in Beijing, China December 8, 2015. (Photo by Kim Kyung-Hoon/Reuters)





Morning commuters wearing protective masks to shield from extreme smog pass by a food vendor in central Beijing December 8, 2015 as China's capital issues its first ever "red alert" for pollution. (Photo by Damir Sagolj/Reuters)





A commuter wearing a protective mask to shield from extreme smog exits subway station in central Beijing December 8, 2015 as China's capital issues its first ever "red alert" for pollution. (Photo by Damir Sagolj/Reuters)





A security guard wearing a protective mask to shield from extreme smog stands in his booth in central Beijing December 8, 2015 as China's capital issues its first ever "red alert" for pollution. (Photo by Damir Sagolj/Reuters)





Morning commuters wear protective masks to shield from extreme smog in central Beijing December 8, 2015 as China's capital issues its first ever "red alert" for pollution. (Photo by Damir Sagolj/Reuters)





Morning commuters wearing protective masks to shield from extreme smog buy food from a vendor in central Beijing December 8, 2015 as China's capital issues its first ever "red alert" for pollution. (Photo by Damir Sagolj/Reuters)





A primary school student wearing a mask walks along a street with his textbooks amid heavy smog after his school was closed due to the first ever "red alert" for air pollution, in central Beijing, China, December 8, 2015. (Photo by Jason Lee/Reuters)





A woman takes a selfie with her mobile phone in front of an entrance to the Forbidden City amid heavy smog after the city issued its first ever "red alert" for air pollution, in central Beijing, China, December 8, 2015. (Photo by Reuters/China Daily)





A visitor walks among trees as she visits the West Lake amid thick fog and heavy smog in Hangzhou, Zhejiang province, China, December 8, 2015. (Photo by Reuters/China Daily)





A building and a large screen are seen through thick smog in Beijing December 8, 2015 as China's capital issues its first ever "red alert" for pollution. (Photo by Damir Sagolj/Reuters)





A woman wearing a mask protecting from extreme smog takes picture in front of the National Stadium, or the Bird's Nest in Beijing December 8, 2015 as China's capital issues its first ever "red alert" for pollution. (Photo by Damir Sagolj/Reuters)





Women wearing masks protecting them from extreme smog take pictures of themselves at the Tiananmen Gate in Beijing December 8, 2015 as China's capital issues its first ever "red alert" for pollution. (Photo by Damir Sagolj/Reuters)





Policemen wear masks protecting from extreme smog at the Tiananmen Square in Beijing December 8, 2015 as China's capital issues its first ever "red alert" for pollution. (Photo by Damir Sagolj/Reuters)





A man offering photo services wears a mask protecting from extreme smog at the Tiananmen Gate in Beijing December 8, 2015 as China's capital issues its first ever "red alert" for pollution. (Photo by Damir Sagolj/Reuters)





A student (C) walks out of the entrance of a high school, which is closed after the city issued its first ever "red alert" for air pollution, amid heavy smog in Beijing, China, December 8, 2015. (Photo by Reuters/China Daily)





A man wearing a mask uses his mobile phone amid heavy smog after the city issued its first ever "red alert" for air pollution, in Beijing, China, December 8, 2015. (Photo by Kim Kyung-Hoon/Reuters)





A woman wearing a mask dances at a park amid heavy smog after the city issued its first ever "red alert" for air pollution, in Beijing, China, December 8, 2015. (Photo by Kim Kyung-Hoon/Reuters)





A female driver wearing a mask drives a bus amid heavy smog after the city issued its first ever "red alert" for air pollution, in Beijing, China, December 8, 2015. (Photo by Kim Kyung-Hoon/Reuters)





A couple wearing masks make their ways in a shopping district amid heavy smog after the city issued its first ever "red alert" for air pollution, in Beijing, China, December 8, 2015. (Photo by Kim Kyung-Hoon/Reuters)





A passenger wearing a mask walks out of a ticket barrier after the city issued its first ever "red alert" for air pollution, in Beijing, China, December 8, 2015. (Photo by Kim Kyung-Hoon/Reuters)





People have their cameras ready before a flag-raising ceremony amid heavy smog at the Tiananmen Square, after the city issued its first ever "red alert" for air pollution, in Beijing December 9, 2015. (Photo by Damir Sagolj/Reuters)





A paramilitary policeman wears a mask on a cold morning as people gather for a flag-raising ceremony amid heavy smog at the Tiananmen Square, after the city issued its first ever "red alert" for air pollution, in Beijing December 9, 2015. (Photo by Damir Sagolj/Reuters)





People gather before dawn at the Tiananmen Square for a flag-raising ceremony amid heavy smog, after the city issued its first ever "red alert" for air pollution, in Beijing December 9, 2015. (Photo by Damir Sagolj/Reuters)





A man has his picture taken just after a flag-raising ceremony amid heavy smog at the Tiananmen Square, after the city issued its first ever "red alert" for air pollution, in Beijing December 9, 2015. (Photo by Damir Sagolj/Reuters)





People gather before the sunrise at the Tiananmen Square for a flag-raising ceremony amid heavy smog, after the city issued its first ever "red alert" for air pollution, in Beijing December 9, 2015. (Photo by Damir Sagolj/Reuters)





People have their cameras ready before a flag-raising ceremony amid heavy smog at the Tiananmen Square, after the city issued its first ever "red alert" for air pollution, in Beijing December 9, 2015. (Photo by Damir Sagolj/Reuters)





Paramilitary policemen wear masks on a cold morning as people gather for a flag-raising ceremony amid heavy smog at the Tiananmen Square, after the city issued its first ever "red alert" for air pollution, in Beijing December 9, 2015. (Photo by Damir Sagolj/Reuters)





A woman wearing a protective mask has her picture taken just after a flag-raising ceremony amid heavy smog at the Tiananmen Square, after the city issued its first ever "red alert" for air pollution, in Beijing December 9, 2015. (Photo by Damir Sagolj/Reuters)





People film with their cameras during a flag-raising ceremony amid heavy smog at the Tiananmen Square, after the city issued its first ever "red alert" for air pollution, in Beijing December 9, 2015. (Photo by Damir Sagolj/Reuters)





People gather before sunrise at Tiananmen Square for a flag-raising ceremony amid heavy smog, after the city issued its first ever "red alert" for air pollution, in Beijing December 9, 2015. (Photo by Damir Sagolj/Reuters)





Paramilitary policemen wearing masks march on a cold morning following a flag-raising ceremony amid heavy smog at Tiananmen Square, after the city issued its first ever "red alert" for air pollution, in Beijing December 9, 2015. (Photo by Damir Sagolj/Reuters)





People gather before sunrise at Tiananmen Square for a flag-raising ceremony amid heavy smog, after the city issued its first ever "red alert" for air pollution, in Beijing December 9, 2015. (Photo by Damir Sagolj/Reuters)





People with national flags have their picture taken just after a flag-raising ceremony amid heavy smog at Tiananmen Square, after the city issued its first ever "red alert" for air pollution, in Beijing December 9, 2015. (Photo by Damir Sagolj/Reuters)





People gather at the Tiananmen Square for a flag-raising ceremony amid heavy smog, after the city issued its first ever "red alert" for air pollution, in Beijing December 9, 2015. (Photo by Damir Sagolj/Reuters)





A man smiles as his picture is taken just after a flag-raising ceremony amid heavy smog at the Tiananmen Square, after the city issued its first ever "red alert" for air pollution, in Beijing December 9, 2015. (Photo by Damir Sagolj/Reuters)





Traffic assisting coordinators wearing masks work at a bus station amid heavy smog after the city issued its first ever "red alert" for air pollution, in Beijing, China, December 9, 2015. (Photo by Reuters/China Daily)





A "mist cannon" works alongside a street on a smoggy day in Changsha, Hunan province, China, December 8, 2015. (Photo by Reuters/Stringer)





A man holding a receipt from an ATM machine in his mouth walks out of a branch of Postal Savings Bank of China (PSBC) in downtown Beijing, China, in this November 12, 2015 file photo. China's Postal Savings Bank said it had raised $7 billion from a 17 percent stake sale that attracted 10 strategic investors, including UBS Group AG and JPMorgan ahead of an initial public offering planned for next year. (Photo by Kim Kyung-Hoon/Reuters)





A Chinese man wears a mask to protect against pollution as he waits at a red light while commuting to work in heavy smog on December 8, 2015 in Beijing, China. The Beijing government issued a 'red alert' for the first time since new standards were introduced earlier this year as the city and many parts of northern China were shrouded in heavy pollution. Levels of PM 2.5, considered the most hazardous, crossed 400 units in Beijing, lower than last week, but still nearly 20 times the acceptable standard set by the World Health Organization. The governments of more than 190 countries are meeting in Paris to set targets on reducing carbon emissions in an attempt to forge a new global agreement on climate change. (Photo by Kevin Frayer/Getty Images)





A Chinese man and his child wear masks to protest against pollution as they walk through a shopping area in heavy smog on December 8, 2015 in Beijing, China. The Beijing government issued a "red alert" for the first time since new standards were introduced earlier this year as the city and many parts of northern China were shrouded in heavy pollution. Levels of PM 2.5, considered the most hazardous, crossed 400 units in Beijing, lower than last week, but still nearly 20 times the acceptable standard set by the World Health Organization. The governments of more than 190 countries are meeting in Paris to set targets on reducing carbon emissions in an attempt to forge a new global agreement on climate change. (Photo by Kevin Frayer/Getty Images)





A Buddhist believer wearing mask meditates at Temple of Heaven Park during a heavy pollution day, December 9, 2015, in Beijing. (Photo by Feng Li/Getty Images)