How to judge the quality of air?

The air quality reflects the degree of air pollution, which is judged according to the concentration of pollutants in the air. Air pollution is a complex phenomenon. At a specific time and place, the concentration of air pollutants is affected by many factors. Man-made pollutant emissions from fixed pollution sources and mobile pollution sources are one of the most important factors affecting air quality, including vehicle, ship and aircraft exhaust, industrial enterprise production emissions, residents' living heating, garbage incineration and so on. Urban development density, topography and meteorology are also important factors affecting air quality. Air pollution index API range and corresponding air quality categories Air pollution index API air quality categories The impact of air quality description on health and corresponding measures.

Air pollution index

The air quality of API shows the influence of color on health. The suggested measures are 0-50: excellent and normal activities 5 1- 100: good and 100-200: the symptoms of people vulnerable to mild pollution are slightly aggravated, and patients with heart disease and respiratory diseases in healthy people should reduce physical exertion and outdoor activities. The symptoms of patients with moderate pollution heart disease and lung disease are obviously aggravated, and their exercise tolerance is reduced. 300 heavily polluted healthy people have decreased exercise tolerance and obvious strong symptoms. The elderly and patients with certain diseases in advance should stay indoors to avoid physical exertion, and the general population should avoid outdoor activities.