How to divide the smog pollution level?

Classification of smoke pollution levels:

According to the classification method and hazard degree in Technical Regulations of Ambient Air Quality Index, it is divided into three levels:

Level 1 (extremely heavy pollution), that is, the air quality index in this area has been above 500 for 24 consecutive hours.

Grade II (serious pollution), that is, the air quality index in this area for 48 hours is within the range of 30 1 to 500 (inclusive).

Grade III (heavy pollution), that is, the air quality index in this area for 72 hours is within the range of 20 1 to 300 (inclusive).

Introduction to the classification of smog warning grades;

The smog warning signal is divided into three levels, which are represented by yellow, orange and red, respectively, corresponding to moderate smog, severe smog and severe smog in the forecast level clause.

China Meteorological Bureau divides the smog warning into three levels: yellow, orange and red, which correspond to moderate smog, severe smog and extremely severe smog respectively. In the classification of early warning levels, meteorological factors such as PM2.5 concentration, atmospheric visibility and relative humidity, which reflect air quality, are listed as important indicators of early warning classification for the first time. At the same time, the introduction of PM2.5 concentration index in smog warning also makes it more scientific and operable to issue smog warning separately. According to reports, China Meteorological Bureau is organizing experts to further study and revise the relevant norms and standards of smog warning signals. After the current standards are tried out for a period of time, they will be revised according to the actual situation.

Related extensions:

Haze weather is very harmful to us, not only affecting the respiratory tract, but also affecting the eyes. Severe smog will cause a lot of discomfort to your eyes, so don't be lazy at this time. It is necessary to protect your eyes in time. Wash your eyes with preservative-free eye drops when you get home. You can use Hailu sodium hyaluronate eye drops to reduce the harm of smog pollutants to the eye surface. Hailu sodium hyaluronate eye drops are available in Tmall Medical Museum. In addition, reducing going out in foggy days is the best way to protect your eyes.

Introduction to the classification of smog warning grades;

The smog warning signal is divided into three levels, which are represented by yellow, orange and red, respectively, corresponding to moderate smog, severe smog and severe smog in the forecast level clause.

Haze yellow warning signal

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Standard: It is expected that one of the following situations may occur in the next 24 hours and continue 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.

Haze orange warning signal

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

(1) Haze with visibility less than 2000m and relative humidity less than 80%.

(2) Visibility is less than 2,000 m, relative humidity is greater than or equal to 80%, and PM2.5 concentration is greater than 150 μ g/m3 and less than or equal to 250 μ g/m3.

(3) Visibility is less than 5000m, and PM2.5 concentration is more than 250μ g/m3 and less than or equal to 500μ g/m3.