Photo: Fog in Chengdu 成都, China, by Kristoffer Trolle

Fog in Chengdu 成都, China, by Kristoffer Trolle (CC BY 2.0)

source https://chinadigitaltimes.net/2021/05/photo-fog-in-chengdu-%e6%88%90%e9%83%bd-china-by-kristoffer-trolle/