What does the low air pollution index mean for the air quality on this day?

The air pollution index is divided into 0-50,51-100,1-150,151-200,20/kloc. The smaller the index, the lower the level, indicating that the pollution is lighter.

Air pollution index is to determine the classification value of pollution index and the corresponding pollutant concentration limit according to the air environmental quality standards and the ecological environmental effects of various pollutants and their impact on human health. The air pollution index grading standard adopted by the weekly air quality report is:

Air pollution index (API) 1 and 50 points correspond to the first-class standard of national air quality daily average;

2. The pollutant concentration corresponding to API100 is the national secondary standard of daily average air quality;

3. The pollutant concentration corresponding to 3.API200 is the national air quality daily average level III standard;

4. The classification of 4.API high-value segment corresponds to the concentration limit when various pollutants have different effects on human health.