China Naming Network - Solar terms knowledge - The three-level response to heavy pollution stopped for a few days.
The three-level response to heavy pollution stopped for a few days.
2-3 days.
Three-level emergency response: When the daily AQI of the yellow warning forecast is less than 200 or the daily AQI is less than 150 for 48 hours or more, it takes 2 to 3 days to start the three-level emergency response.
The third level of heavy air pollution weather is a high warning level of heavy air pollution.