Formation and harm of haze weather

Haze weather is mainly caused by human factors and natural weather factors. Let me answer your question about its formation and harm.

1. Intuitively, we feel that there is something "gray" like fog in the air. We call it "suspended particles", and its particle size is generally 100 micron.

2. If the suspended particles are large, they will fall down once suspended. 10 micron can be suspended for a long time, and 2.5 micron can be inhaled into human alveoli and cannot be discharged, which will cause permanent damage to the lungs. Therefore, our research on smog mainly refers to PM2.5, that is, suspended particles with a particle size less than 2.5.

There are many sources of smog, which is scientific. Only by analyzing the composition of PM2.5 can we know the main source of smog.

4. Basically, smog comes from coal burning, automobile exhaust emission and building dust.

Smog weather is caused by automobile exhaust, factory exhaust and fireworks.

6. When the suspended water vapor in the atmosphere condenses and the visibility is lower than 1000m, it is called fog in meteorology.

When the water vapor in the air reaches the maximum, it will be saturated. If the water vapor is more than saturated, the excess will condense out and combine with tiny dust particles in the air to form small water droplets or ice crystals, which will be suspended in the air layer near the ground and become fog. The lower the temperature, the less water vapor can be contained in the air, and the easier it is to form smog.

8. Its harm is that smog has a certain impact on traffic safety and is easy to cause traffic jams and traffic accidents. It will also lead to the weakening of ultraviolet rays on the surface and the enhancement of bacterial activities in the air.