Woman wearing protective masks walk on a heavily polluted day in Beijing, December 25, 2015. (Photo by Kim Kyung-Hoon/Reuters)





A couple embraces while workers clean the exterior of the Shanghai World Financial Center skyscraper amid heavy smog at the financial district of Pudong in Shanghai, China, December 25, 2015. (Photo by Aly Song/Reuters)





A general view of Shanghai's financial district of Pudong as seen from the Shanghai World Financial Center amid heavy smog in Shanghai, China, December 25, 2015. (Photo by Aly Song/Reuters)





Workers clean the exterior of Shanghai World Financial Center amid heavy smog at the financial district of Pudong in Shanghai, China, December 25, 2015. (Photo by Aly Song/Reuters)





Tourists walk above a tea plantation in Enshi, Hubei province, December 27, 2015. (Photo by Reuters/Stringer)





Tourists react as they walk above a tea plantation in Enshi, Hubei province, December 27, 2015. (Photo by Reuters/Stringer)





Tourists walk above a tea plantation in Enshi, Hubei province, December 27, 2015. (Photo by Reuters/Stringer)





People skate on a lake at Taoranting Park during a hazy day, in Beijing, China, December 26, 2015. (Photo by Reuters/Stringer)





More than a thousand eggs are boiled with spices in a pot during a “crazy egg eating” game in Qingyuan, Guangdong province, December 27, 2015. Nearly a thousand tourists participated in the game. A tourist had five hot eggs eaten in a minute, according to local media. (Photo by Reuters/Stringer)





Bai Dijun rides his homemade carriage which resembles the carriage used by the British royal family, in Liangping, Gansu province, December 27, 2015. Bai makes money from renting the carriage to tourists and as props to commercial performance organizers, according to local media. (Photo by Reuters/Stringer)





A man swims in the half-frozen Shichahai Lake on a hazy day in Beijing, China, December 25, 2015. (Photo by Reuters/Stringer)





People participate in a winter fishing event in Changling Lake in Harbin, Heilongjiang province, December 27, 2015. (Photo by Reuters/China Daily)





Villagers visit a home-made Boeing 737 look-alike at a crop field in Neihuang county, Henan province, December 27, 2015. Farmer Wang Lanqun spent a year making the 35-meter-long plane-shaped installation. With some further decoration, the “plane” will be later transformed into a restaurant, according to local media. (Photo by Reuters/China Daily)





Children play inside a home-made Boeing 737 look-alike at a crop field in Neihuang county, Henan province, December 27, 2015. (Photo by Reuters/China Daily)





Children play inside a home-made Boeing 737 look-alike at a crop field in Neihuang county, Henan province, December 27, 2015. (Photo by Reuters/China Daily)





Ethnic Dong children wearing traditional costumes attend Duoye Festival, in Sanjiang, Guangxi Zhuang Autonomous Region, December 26, 2015. Locals hold chorus and group dancing activities during the festival, according to local media. (Photo by Reuters/China Daily)





Cremation technicians put a coffin into a cremator as they participate in a skills competition in Beijing, China, December 27, 2015. According to local media, 54 cremation technicians from all over China took part in the competition. Judges scored them on how accurately they performed according to the national standard of cremation procedure. (Photo by Reuters/China Daily)





A technician participates in a cremation skills competition in Beijing, China, December 27, 2015. (Photo by Reuters/China Daily)





A technician participates in a cremation skills competition in Beijing, China, December 27, 2015. (Photo by Reuters/China Daily)