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Haze and weather, pollution emissions and so on.
In fact, haze weather continued, air quality decline, not a new phenomenon this year. In recent years, every autumn and winter, especially after the winter, China's eastern region from time to time encounter such a situation, both for meteorological reasons, but also pollution reasons.
Central Meteorological Station chief forecaster Ma Xueqian said that the recent emergence of fog in the eastern part of the meteorology known as radiation fog, the main reasons for the formation of three points: First, these areas near the ground relative humidity is relatively large; Second, there is no obvious cold Air activity, the wind is small, the atmosphere is relatively stable; Third, the sky sunny little cloud, is conducive to the night of radiation cooling, near the ground near the original humidity is relatively high air saturation condensation fog.
Large fog haze weather mainly occurs in the cold air and water vapor conditions better large-scale atmospheric circulation situation, near the ground low altitude for the static wind or breeze. Controlled by near-ground static weather, air in the horizontal and vertical mobility are very small, atmospheric diffusion conditions are very poor. By its control, regardless of the size of the city, the local traffic, life, production of energy consumption required for the production of pollutants are accumulated in the low level. At the same time, due to the high humidity of the haze weather, the water vapor is large, the droplets provide the adsorption and reaction sites to accelerate the conversion of the reactive gaseous pollutants to the liquid particulate matter, and the particles are also easy to accelerate the formation of haze as condensing nuclei , The two interact, the rapid formation of pollution.
Environmental experts say that if there is a long haze in the winter, usually in the northern region because of the heating period of the soaring energy consumption emissions, moderate urban population concentration of large urban areas of the main city for three consecutive days of air pollutant accumulation may To the extent of heavy pollution in the southern region if the production and traffic emissions may also reach the extent of heavy pollution.
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