What are the factors that affect atmospheric visibility?

Impurities in the air. Impurities include solid particles, liquid droplets, etc. Solid particles are so-called dust, smoke, haze and so on. Droplets are fog, steam, etc.

2. sunshine. Cloudy day, weak sunshine and low visibility.

3. Temperature and humidity. Temperature and humidity do not directly affect visibility, but in humid and low-temperature weather, there are more fog and steam, and dust is not easy to spread, which indirectly affects visibility. In summer, the temperature is high and humidity is high, and there is a strong convective climate, which causes local rainfall and affects visibility.

Matters needing attention in atmospheric visibility

Haze with visibility less than 3000m and relative humidity less than 80%.

Visibility is less than 3000m, relative humidity is greater than or equal to 80%, and PM2.5 concentration is greater than 1 15 μ g/m3 and less than or equal to 150 μ g/m3.

The visibility is less than 5000m, and the concentration of PM2.5 is greater than150μ g/m3 and less than or equal to 250μ g/m3.

Refer to the above? Baidu Encyclopedia-Atmospheric Visibility, People's Network-How much does meteorological conditions affect the formation of smog? The mystery is revealed!