Influencing factors of air quality and health

Urban air pollution depends on two factors: pollutant emission and atmospheric diffusion capacity. When the pollution source is relatively stable, the diffusion, migration, flow and transformation of pollutants in the atmosphere are closely related to the meteorological conditions at that time, and meteorological factors such as wind direction, wind speed, inversion stratification and precipitation play an important role in the diffusion of pollutants. For example, when there is precipitation or wind, it is often conducive to the diffusion of pollutants in the air; On the contrary, it is easy to aggravate air pollution when there is fog or the wind is very small. Therefore, air quality forecasting enables us to monitor air pollution in real time, predict the future air quality according to the changes of future meteorological conditions, and consciously reduce or reduce pollutant emissions, so as to achieve the goal of passive defense to active prevention.

Impact on human health

The air pollution index is less than 50, which means that the air quality is good and it is first-class excellent.

The air pollution index is more than 50 and less than 100, which is second-class good.

The air pollution index is greater than 100 and less than 200, which means that the pollutant concentration is less than the three-level standard limit of ambient air quality, that is, the air quality required by a specific industrial zone; During this index period, the symptoms of susceptible people are slightly aggravated, and healthy people have irritating symptoms. Patients with heart disease and respiratory diseases should reduce physical exertion and outdoor activities;

The air pollution index is greater than 300, which is a serious pollution. The exercise tolerance of healthy people is reduced, the symptoms are obviously strong, and some diseases appear in advance; The elderly and patients should stay indoors to avoid physical exertion, and the general population should avoid outdoor activities.