Why is the smog produced in some areas particularly serious?

Haze is a combination of fog and haze. Because of the deterioration of air quality, cloudy days have increased and the harm has increased. In many areas of our country, the smog weather phenomenon is combined with fog as an early warning and forecast of disastrous weather. Collectively referred to as "haze weather". The increase of suspended particles in the air. With the growth of urban population and industrial development, the number of motor vehicles has soared, and the emissions of pollutants and suspended solids have increased greatly, which directly leads to the decline of visibility.

Experts pointed out that the recent fog in the central and eastern regions is called radiation fog in meteorology, and the main reasons for the formation of haze weather are as follows:

First, the relative humidity of the air near the ground in these areas is relatively high, and the ground dust is relatively large, which is stirred by people and traffic on the ground;

Second, there is no obvious cold air activity, the wind is small and the atmosphere is relatively stable. Because the air does not flow, the tiny particles in the air gather together and float in the air.

Third, the sky is clear and partly cloudy, which is conducive to radiation cooling at night and makes the near-surface air with relatively high humidity saturate and condense to form fog.

Fourth, automobile exhaust is the main pollutant emission. In recent years, there are more and more cars in cities, and automobile exhaust is a factor of smog;

Five, secondary pollution produced by the factory;

Six, winter heating emissions of carbon dioxide and other pollutants.

Large-scale haze weather mainly appears in the situation of large-scale atmospheric circulation with weak cold air and good water vapor conditions, and the low altitude near the ground is still wind or breeze. Due to the high humidity and high water vapor in foggy days, fog droplets provide adsorption and reaction sites, which accelerate the transformation of reactive gaseous pollutants into liquid particulate components, and particulate matter is also easy to act as condensation nuclei to accelerate the formation of smog, and the interaction between them quickly forms pollution.

According to environmental experts, usually in winter in the northern region, due to the soaring energy consumption and emissions during the heating period, the accumulation of air pollutants in the main urban areas with concentrated population and large emissions in medium-sized cities may reach the level of heavy pollution for three consecutive days, and if the production and traffic emissions in the southern region are large, it may also reach the level of heavy pollution.