Traditional Culture Encyclopedia - Weather forecast - Heavy pollution weather warning level color level
Heavy pollution weather warning level color level
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.
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