INDIA-POLLUTION-CLIMATE(01 of15)
Open Image ModalAn Indian schoolgirl covers her nose and mouth as she walks with others along a busy road on a smoggy day in New Delhi on November 30, 2015. Some 150 leaders including US President Barack Obama, China's Xi Jinping, India's Narendra Modi and Russian President Vladimir Putin will attend the start of the Paris conference on climate change, which starts on November 30, tasked with reaching the first truly universal climate pact. AFP PHOTO / Money SHARMA / AFP / MONEY SHARMA (Photo credit should read MONEY SHARMA/AFP/Getty Images) (credit:MONEY SHARMA via Getty Images)
Beijing Blanketed In Heavy Smog(02 of15)
Open Image ModalBEIJING, CHINA - NOVEMBER 30: Chinese Paramilitary Police officers march through Tiananmen Square as the sun is seen on a day of heavy pollution on November 30, 2015 in Beijing, China. China's capital and many cities in the northern part of the country recorded the worst smog of the year with air quality devices in some areas unable to read such high levels of pollutants. Levels of PM 2.5, considered the most hazardous, crossed 600 units in Beijing, nearly 25 times the acceptable standard set by the World Health Organization. The governments of more than 190 countries are meeting in Paris this week 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) (credit:Kevin Frayer via Getty Images)
Beijing Blanketed In Heavy Smog(03 of15)
Open Image ModalBEIJING, CHINA - NOVEMBER 30:A Chinese police officer wears a protective mask as he stands in a very hazy Tiananmen Square on a day of heavy pollution on November 30, 2015 in Beijing, China. China's capital and many cities in the northern part of the country recorded the worst smog of the year with air quality devices in some areas unable to read such high levels of pollutants. Levels of PM 2.5, considered the most hazardous, crossed 600 units in Beijing, nearly 25 times the acceptable standard set by the World Health Organization. The governments of more than 190 countries are meeting in Paris this week 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) (credit:Kevin Frayer via Getty Images)
Beijing Blanketed In Heavy Smog(04 of15)
Open Image ModalBEIJING, CHINA - NOVEMBER 30: A Chinese woman wears a mask as she walks through a very hazy Tiananmen Square on a day of heavy pollution on November 30, 2015 in Beijing, China. China's capital and many cities in the northern part of the country recorded the worst smog of the year with air quality devices in some areas unable to read such high levels of pollutants. Levels of PM 2.5, considered the most hazardous, crossed 600 units in Beijing, nearly 25 times the acceptable standard set by the World Health Organization. The governments of more than 190 countries are meeting in Paris this week 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) (credit:Kevin Frayer via Getty Images)
Beijing Blanketed In Heavy Smog(05 of15)
Open Image ModalBEIJING, CHINA - NOVEMBER 30:A Chinese woman wears a mask as she walks through a very hazy Tiananmen Square on a day of heavy pollution on November 30, 2015 in Beijing, China. China's capital and many cities in the northern part of the country recorded the worst smog of the year with air quality devices in some areas unable to read such high levels of pollutants. Levels of PM 2.5, considered the most hazardous, crossed 600 units in Beijing, nearly 25 times the acceptable standard set by the World Health Organization. The governments of more than 190 countries are meeting in Paris this week 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) (credit:Kevin Frayer via Getty Images)
Heavy Smog Hits Shanghai(06 of15)
Open Image ModalSHANGHAI, CHINA - NOVEMBER 30: (CHINA OUT) Buildings at the Lujiazui Financial District are shrouded in smog on November 30, 2015 in Shanghai, China. Shanghai's real-time Air pollution index (API) read high 189 on Monday morning. (Photo by ChinaFotoPress/ChinaFotoPress via Getty Images) (credit:ChinaFotoPress via Getty Images)
Beijing Blanketed In Heavy Smog(07 of15)
Open Image ModalBEIJING, CHINA - NOVEMBER 30: A residence community is blanketed by smog on November 30, 2015 in Beijing, China. (Photo by Xiao Lu Chu/Getty Images) (credit:Xiao Lu Chu via Getty Images)
Heavy Smog Hits Shanghai(08 of15)
Open Image ModalSHANGHAI, CHINA - NOVEMBER 30: (CHINA OUT) Buildings at the Lujiazui Financial District are shrouded in smog on November 30, 2015 in Shanghai, China. Shanghai's real-time Air pollution index (API) read high 189 on Monday morning. (Photo by ChinaFotoPress/ChinaFotoPress via Getty Images) (credit:ChinaFotoPress via Getty Images)
Beijing Blanketed In Heavy Smog(09 of15)
Open Image ModalBEIJING, CHINA - NOVEMBER 30: A residence community is blanked by smog on November 30, 2015 in Beijing, China. (Photo by Xiao Lu Chu/Getty Images) (credit:Xiao Lu Chu via Getty Images)
Beijing Blanketed In Heavy Smog(10 of15)
Open Image ModalBEIJING, CHINA - NOVEMBER 30: A subway terminal is blanked by smog on November 30, 2015 in Beijing, China. (Photo by Xiao Lu Chu/Getty Images) (credit:Xiao Lu Chu via Getty Images)
Beijing Blanketed In Heavy Smog(11 of15)
Open Image ModalBEIJING, CHINA - NOVEMBER 30: A residence community is blanked by smog on November 30, 2015 in Beijing, China. (Photo by Xiao Lu Chu/Getty Images) (credit:Xiao Lu Chu via Getty Images)
Beijing Blanketed In Heavy Smog(12 of15)
Open Image ModalBEIJING, CHINA - NOVEMBER 30: A residence community is blanked by smog on November 30, 2015 in Beijing, China. (Photo by Xiao Lu Chu/Getty Images) (credit:Xiao Lu Chu via Getty Images)
Heavy Smog Hits Shanghai(13 of15)
Open Image ModalSHANGHAI, CHINA - NOVEMBER 30: (CHINA OUT) Buildings at the Lujiazui Financial District are shrouded in smog on November 30, 2015 in Shanghai, China. Shanghai's real-time Air pollution index (API) read high 189 on Monday morning. (Photo by ChinaFotoPress/ChinaFotoPress via Getty Images) (credit:ChinaFotoPress via Getty Images)
Heavy Smog Hits Shanghai(14 of15)
Open Image ModalSHANGHAI, CHINA - NOVEMBER 30: (CHINA OUT) Buildings at the Lujiazui Financial District are shrouded in smog on November 30, 2015 in Shanghai, China. Shanghai's real-time Air pollution index (API) read high 189 on Monday morning. (Photo by ChinaFotoPress/ChinaFotoPress via Getty Images) (credit:ChinaFotoPress via Getty Images)
Heavy Smog Hits Shanghai(15 of15)
Open Image ModalSHANGHAI, CHINA - NOVEMBER 30: (CHINA OUT) Buildings at the Lujiazui Financial District are shrouded in smog on November 30, 2015 in Shanghai, China. Shanghai's real-time Air pollution index (API) read high 189 on Monday morning. (Photo by ChinaFotoPress/ChinaFotoPress via Getty Images) (credit:ChinaFotoPress via Getty Images)