Heavy pollution weather warning level color level

According to the development trend and severity of heavily polluted weather, the newly revised "Pre-plan" divides the warning levels into regional IV, III, II and I, with I being the highest level. Warning colors are blue, yellow, orange and red. The emergency response levels of heavily polluted weather are also divided into regional IV, III, II and I, and I is also the highest level. The newly revised "Plan" divides the warning level of heavy pollution weather into more details. The warning level was revised from the previous three levels of yellow, orange and red to four levels of blue, yellow, orange and red.

When the daily average value of AQI (air quality index) is >: 200, it will last 1 day, and the blue warning will be started; When AQI >: 200 daily average will last for more than 2 days, start the yellow warning; When the daily average value of AQI >: 200 will last for 3 days, and when the daily average value of AQI appears >: 300 will last for 1 day, an orange warning will be started; When it is predicted that the daily average value of urban AQI >: 200 will last for more than 4 days, the daily average value of AQI >: 300 will last for 2 days or more, or when it is predicted that the daily average value of AQI reaches 500 and will last for 1 day or more, the red warning will be started.

At the same time, the regional early warning of heavily polluted weather is also divided into four levels: blue, yellow, orange and red. In principle, early warning information should be released 1 day (24 hours) in advance, including the possible time, scope, pollution degree, main pollutants, early warning level and meteorological conditions of heavily polluted weather.