What is the standard of air index?

The standards of air index are 0 ~ 50, 5 1 ~ 100,1~ 200, 20 1 ~ 300 and greater than 300, which respectively correspond to the national air quality standards.

In practical application, III and IV are divided into III (1), III (2), IV (1) and IV (2). Grade I, the air quality evaluation is excellent, and it has no impact on human health. Grade II, with good air quality evaluation and no obvious impact on human health.

Grade III, light pollution, irritating symptoms in healthy people. Grade Ⅳ, moderate pollution, generally irritating symptoms in healthy people. Grade V, seriously polluted, with severe irritation to healthy people.

The importance of air quality

We breathe all the time. A person breathes more than 20,000 times a day and exchanges at least 1 10,000 liters of gas with the environment every day. It can be seen that air quality is closely related to human health.

An adult breathes more than 20,000 times a day and inhales about 20 kilograms of air, which is 10 times more than the food and water he takes in a day. People can live without food for 20 days, without water for 7 days, without sleep for 5 days and without breathing for 10 minute. Obviously, air is more important than food and water.