In which months does smog usually appear?

Smog is very common in our daily lives, especially in cities. Smog weather has greatly harmed people's health. To deal with smog is to transform the air environment, so this issue of smog culture will analyze it for you.

Seasons when smog occurs

Normally, the most serious smog is in November and December. The peak period of smog is mainly in autumn and winter, especially in cold weather. In winter, the probability of occurrence is highest and more serious. However, meteorological experts said: The occurrence of haze days is not restricted by season. Although it is more common in autumn and winter, it will still occur in spring and summer.

Causes of smog

Smog weather has obvious seasonality and mainly occurs in autumn and winter. In autumn and winter, due to low temperatures and weak surface pressure field; the wind near the ground is small, If there is no cold air activity, the atmospheric stratification will be relatively stable, and there will be a temperature inversion layer near the ground, which is not conducive to the dilution and diffusion of pollutants. At this time, if the humidity is high, it is easy to form haze weather.

Because atmospheric pollutants have been increasing rapidly, overall, if there are no effective measures, the haze will become more serious year by year.

The meaning of smog

Smog, as the name suggests, is fog and haze. But there is a big difference between fog and haze. The aerosol system composed of dust, sulfuric acid, nitric acid and other particulate matter in the air causes visual impairment called haze. Haze is haze (smoke).

Fog is an aerosol system composed of a large number of tiny water droplets or ice crystals suspended in the air near the ground. It mostly appears in autumn and winter (which is also one of the reasons for the widespread haze weather across the country in January 2013). It is the product of water vapor condensation (or sublimation) in the air near the ground. The existence of fog will reduce the transparency of the air and worsen the visibility. If the horizontal visibility of the target object is reduced to less than 1,000 meters, the weather phenomenon of water vapor condensation (or sublimation) suspended in the air near the ground is called fog (Fog) .