What's the weather like in four quarters?

The meteorological symbol of multi-point inverted 8 indicates that the weather phenomenon is smog. The standard smog weather symbol is 8 lying down, and the smog weather symbol issued by some meteorological bureaus (such as Guangzhou Meteorological Bureau) is more than 8 lying down and less than 3 points. The background color of smog weather symbols in the daytime is blue, and the background color of smog weather symbols at night is black.

The classification items of smog prediction correspond to moderate smog, severe smog and severe smog respectively. That is, the smog warning level is yellow, orange and red from low to high. The core substance of smog is dust particles suspended in the air, which are called aerosol particles in meteorology. In recent years, the occurrence frequency of "smog" weather phenomenon is getting higher and higher, which leads to the gradual deterioration of air quality.

Extended data:

1. Under the condition of moderate smog weather, we should reduce unnecessary outdoor activities, moderately reduce the amount and intensity of exercise, and prevent respiratory diseases.

2. Under severe haze weather conditions: try to avoid outdoor activities and prevent respiratory diseases; Pay more attention to traffic safety when visibility is poor.

3. In foggy weather, ordinary citizens should do: old people and children should go out less, drive and walk carefully, and pay attention to exercise.

Baidu encyclopedia-smog

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