Smog, Haze. 霧霾, 霧霾

Haze covers Tianjin on Dec 10, 2016. PHOTO: REUTERS

Old Summer Palace in smog on a polluted day as the authorities issued a red alert in Beijing, China, on Dec 17, 2016.PHOTO: REUTERS

The Forbidden City in Beijing shrouded in smog. Beijing city officials issued a red alert air pollution warning on Dec 15, 2016.PHOTO: AFP
Highways shut, flights grounded as smog blankets China's Tianjin, East Asia News & Top Stories - The Straits Times
http://www.straitstimes.com/asia/east-asia/highways-shut-flights-grounded-as-smog-blankets-chinas-tianjin

Jinan, China
A woman rides in smog as air quality index readings exceeded 400 and some schools suspended classes
Photograph: VCG via Getty Images
Best photographs of the day: underwater Santas and a giant bauble | News | The Guardian
https://www.theguardian.com/news/gallery/2016/dec/20/best-photographs-of-the-day-underwater-santas-and-a-giant-baubl

Greg Baker/AFP/Getty Images
Beijing smog
A boy waits with a relative outside a hospital in Beijing. Heavy smog suffocated northeast China for a fifth day on December 20th, with hundreds of flights cancelled with road and rail transport grinding to a halt due to low visibility conditions.Photo Greg Baker/AFP/Getty Images
FT Photo Diary | The Financial Times picture desk showcases the best images from around the world
http://blogs.ft.com/photo-diary/

Smog - Wikipedia

霾（英语：Smog，又稱灰霾、煙霧或霧霾，香港稱為煙霞）

Haze - Wikipedia

煙霧，或霧霾，是一種空氣污染現象，香港稱毒霧