In which season is ozone seriously polluted?

Ozone is seriously polluted in late spring and summer.

The seasonal high-frequency period of ozone pollution is usually in the sunny and high-temperature weather conditions in late spring, summer and early autumn. This is because the formation of ozone pollution requires three conditions: temperature above 2°C, sufficient water vapor and light. Under these conditions, nitrogen oxides and volatile organic compounds will accumulate to a higher concentration under the action of light and temperature, thus forming ozone pollution.

In addition, abundant sunshine, high temperature and low humidity in summer are beneficial to the generation and accumulation of ozone. In late spring and autumn, the temperature rises gradually, the rainfall decreases and the humidity in the air increases, which is also beneficial to the generation and accumulation of ozone.

Therefore, ozone pollution is usually the most serious in late spring and summer, but it will gradually decrease in autumn. However, the specific seasonal high-incidence period needs to be comprehensively analyzed in combination with local meteorological conditions and environmental characteristics.

prevention and control of ozone pollution:

the sources of ozone are divided into natural sources and man-made sources. Ozone from natural sources mainly refers to the downward transmission of stratosphere. In 1962, Junge thought that ozone in the stratosphere would decompose under ultraviolet radiation with wavelength less than 24nm, and the generated oxygen atoms would combine with oxygen molecules to produce ozone, which would be transported down to the troposphere and become the source of ozone in the troposphere.

Man-made ozone is mainly generated by photochemical reaction of pollutants such as NOx and VOCs. In sunny days and under the condition of strong ultraviolet radiation, NO2 and others undergo photolysis to generate nitric oxide and oxygen atoms, and oxygen atoms react with oxygen to generate ozone.