China Naming Network - Ziwei knowledge - 20 13 misty weather
20 13 misty weather
Because minerals are used as fuel in industrial production, a large number of pollutants are discharged into the air, coupled with a large number of automobile exhaust emissions, heating in winter also discharges dust into the air, resulting in a large number of tiny dust particles, smoke particles or salt particles suspended in the atmosphere, forming smog.
So choose: a.