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A traffic coordinator on a construction site wears a mask to protect against smoke pollution in Sydney on December 10, 2019. Toxic haze blanketed Sydney on December 10, triggering a chorus of smoke alarms to ring across the city, as Australians braced for "severe" weather conditions expected to fuel deadly bush blazes. (Photo by PETER PARKS / AFP) |
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A couple crosses a street, early in the morning, amid the smog covering Sofia as air pollution reaches "very unhealthy" level in Bulgarian capital on December 10, 2019. (Photo by NIKOLAY DOYCHINOV / AFP) |
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In this slow-shutter zoom effect photo, commuters backed up in traffic during the morning rush hour in Brussels, Tuesday, Dec. 10, 2019. The Belgium capital regularly experiences pollution alert warnings. (AP Photo/Francisco Seco) |
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A couple wearing masks to protect themselves from air pollution walks on the Namsan Mountain in Seoul, South Korea, Tuesday, Dec. 10, 2019. (AP Photo/Ahn Young-joon) |
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Visitors wearing masks to protect from air pollution and cold, walk along the Han River at a park in Seoul, South Korea, Tuesday, Dec. 10, 2019. (AP Photo/Lee Jin-man) |
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The cityscape is covered with air pollution in Seoul, South Korea, Tuesday, Dec. 10, 2019. (AP Photo/Ahn Young-joon) |
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People walk in the park, amid the smog covering Sofia as air pollution reaches "very unhealthy" level in Bulgarian capital on December 9, 2019. (Photo by NIKOLAY DOYCHINOV / AFP) |
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Pedestrians walk during a foggy evening in the town of Obilic, some 10 km north of the capital Pristina, Kosovo, 09 December 2019. Air pollution in Kosovo's capital Pristina caused by power plants and nearby lignite mines during the winter time exceeds air quality index over 400 AQI. EPA/VALDRIN XHEMAJ |