Since autumn and winter, persistent haze has enveloped many provinces in China. There are a lot of harmful substances floating in the air, such as dust particles and smoke particles, which are harmful

Since autumn and winter, persistent haze has enveloped many provinces in China. There are a lot of harmful substances floating in the air, such as dust particles and smoke particles, which are harmful to human health. D

Test analysis: 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, and sewage discharged from chemical plants will cause water pollution, which has nothing to do with smog.