A Fog Event in Gucheng, Hebei Province in Winter 2018 (IMAGE)
Caption
A fog event in Gucheng, Hebei province in winter 2018. Small particles below 1 μm can grow rapidly to large particles, e.g., 2.5 μm during high relative humidity periods, yet the primary particles from coal combustion and traffic emissions would not change much.
Credit
Xiaoxuan Zhao
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