What does the orange warning of smog mean?

The smog warning signal is divided into three levels, which are represented by yellow, orange and red respectively. China Meteorological Bureau organized experts to discuss the smog intensity standard on October 28th, 20 13/KLOC-0, and issued early warning signals according to this standard. During 2065438+2003 65438+28 10, a large range of haze weather occurred in the central and eastern regions of China, resulting in a continuous decline in air quality. In addition to the fog blue warning, the Central Meteorological Observatory also issued a yellow warning signal, which is the first time that China has issued a separate warning. Beijing Meteorological Disaster Warning Signal and Defense Guide (released on 20 13-06- 13) officially stipulates that the smog warning signal is divided into three levels, which are represented by yellow, orange and red respectively.

Editing of Yellow Warning Signal of Haze

standard

It is expected that one of the following situations may occur in the next 24 hours or the actual situation has reached one of the following situations and may continue:

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

(2) 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.

(3) Visibility is less than 5000m, and PM2.5 concentration is greater than150μ g/m3 and less than or equal to 250μ g/m3.

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