What is the warning level of heavy pollution weather?

The emergency warning of heavily polluted weather is divided into three levels from low to high: level III, level II and level I..

The emergency warning of heavily polluted weather is marked with yellow, orange and red respectively, and the red warning is the highest level. In addition to the requirements of the original early warning grading standards, it is also necessary to issue the yellow warning of heavy pollution weather in the Yangtze River Delta region issued by the Yangtze River Delta Regional Air Quality Forecast Center, and the orange warning and red warning of heavy pollution weather in the Yangtze River Delta region issued by the Ministry of Ecology and Environment.

The first-level warning is released to the public after being approved by the deputy mayor of the municipal government in charge of environmental protection, and the first-level warning is released to the public after being approved by the main leaders of the municipal government. When the early warning appears, emergency headquarters Office will release information to the public through radio, television, Internet, electronic display equipment, newspapers and other media, Weibo, SMS, etc. To inform the public to take active health protection measures.

When the daily average value of AQI (air quality index) is >: 200, it will last 1 day, and start the blue warning, when the daily average value of AQI is >; 200 will last for more than 2 days, and the yellow warning will be started. When the daily average of AQI >: 200 lasts for 3 days, the daily average of AQI appears >: 300 lasts 1 day, and the orange pre-rounding will be started. When the daily average value of A0 in the pre-settlement city is >: 200, it will last for more than 4 days, and the daily average value is A01>; 300 will last for 2 days. When the average value of A0 1 day reaches 500 and will last for more than 1 day, the red warning will be started.