What index is aqi?

Air quality index (AQI) is a simple data that can quantitatively describe air quality.

AQI (Air Quality Index) describes the degree of air cleanliness or pollution and its impact on health. The focus of the air quality index is to evaluate the health impact of breathing polluted air for hours or days, and the experience after breathing polluted air for hours or days.

Extended data:

Air quality index, the darker the color, the more serious the pollution. Green stands for good air quality, yellow stands for good, orange stands for light pollution, red stands for moderate pollution, purple stands for heavy pollution and maroon stands for serious pollution.

When AQI is released, it usually takes a 24-hour average, so many mobile phone clients often look at real-time data differently from the media. At the same time, because the air quality index adopted by China and the United States is different from the corresponding pollutant concentration index table, when the pollutant concentration reaches the same value, the AQI calculation results may be different.

Baidu encyclopedia -AQI