Four-level early warning of heavy air pollution

Air pollution is divided into four levels of early warning. According to the degree from light to heavy, heavy air pollution is divided into four levels of early warning, three levels of early warning, two levels of early warning and one level of early warning, which are marked with four colors of blue, yellow, orange and red respectively, and the first level of early warning (red) is the highest level.

1, blue warning: when the predicted daily average of air quality index (AQI) (24-hour average, the same below) is greater than 200 and does not meet the high-level warning conditions.

2. Yellow warning: it is predicted that the daily average value of AQI > 200 will last for 2 days or more, and the high-level warning conditions are not met.

3. orange warning: it is predicted that the daily average value of AQI will be > 200 for 3 days, and the daily average value of AQI will appear >; 300.

4. Red warning: predict that AQI > 200-day average lasts for 4 days or more, and AQI > daily average; 300 will last for 2 days or more, or it is predicted that the daily average AQI will reach 500 and will last for 1 day or more.

Matters needing attention during heavy air pollution

1, Personal protection: Wear a mask when going out, try to choose public transportation to reduce private car travel.

2. Suggestive pollution reduction measures: advocate the public and units that emit air pollutants to take measures to reduce pollutant emissions consciously, such as reducing driving, reducing thermal power generation and optimizing industrial structure.

3. Improvement of indoor air quality: Close doors and windows, use air purifiers, maintain indoor air circulation, and reduce the accumulation of indoor air pollutants.

4. Pay attention to the weather forecast: pay attention to the weather forecast of heavy air pollution and take protective measures in advance.

5. Health monitoring: Pay attention to the air quality index (API), especially children, the elderly and people with respiratory, cardiovascular and cerebrovascular diseases. When the API exceeds 200 that day, try to reduce going out.

6. Follow the early warning information issued by the government: pay attention to the early warning information of heavy air pollution issued by the government and take corresponding protective measures according to the guidelines.

7. Enhance environmental awareness: in daily life, advocate green travel, save energy and reduce emissions, and reduce air pollution from the source.

The above contents refer to Baidu Encyclopedia-Warning Signal of Heavy Pollution Weather.