What is the ranking basis of air energy?

Air energy ranking is based on the following indicators:

1, PM2.5 concentration: PM2.5 refers to particles with a diameter less than or equal to 2.5 microns in the atmosphere, which is harmful to human health. The higher the concentration of PM2.5, the higher the content of fine particles in the air, which has potential risks to respiratory system and health.

2. Ozone concentration: Ozone is an important air pollutant, and high concentration of ozone will stimulate respiratory tract and eyes. The lower the ozone concentration, the better the air quality.

3. Concentration of other pollutants such as sulfur dioxide (SO2), nitrogen dioxide (NO2) and carbon monoxide (CO): These pollutants are also common atmospheric pollutants. The lower the concentration, the better the air quality.

4. Air quality index (AQI): Air quality index (AQI) is a method that comprehensively considers multiple air quality indexes and quantifies them. By converting the concentrations of different pollutants into a unified index, it provides an overall assessment of air quality. The lower the AQI value, the better the air quality.