What does the air smell like in foggy days?

Haze and smog have pungent smells, such as smoke, choking, smoking, choking and other feelings, in addition to physical feelings, but also with a lot of psychological feelings. Haze is mainly solid floating dust particles, and smog is mainly liquid water vapor. Haze is also called atmospheric brown cloud and atmospheric haze. Haze is defined in the ground meteorological observation specification of China Meteorological Bureau.