Three causes of haze weather.

Haze is a combination of fog and haze. Smog is very common in cities. In many areas of China, fog and haze are combined to make early warning and forecast as disastrous weather, which is collectively called haze weather. The following is an article about smog. Study together: Reasons for the formation of haze weather: There are three factors for the formation of haze. First, the phenomenon of static wind in the horizontal direction has increased. The building is getting higher and higher, and the friction coefficient of the ground is getting bigger and bigger, and the friction coefficient is obviously weakened when the wind passes through the urban area. The increase of wind power is not conducive to the diffusion and dilution of atmospheric pollutants to the periphery of urban areas, and it is easy to accumulate high-concentration pollution. The second is the phenomenon of vertical inversion. The inversion layer covers the city, which makes the inversion phenomenon above the low-altitude temperature appear. Under normal climatic conditions, pollutants diffuse from higher temperature to lower temperature and are gradually discharged into the atmosphere. However, under the anti-temperature reaction, the low temperature is getting lower and lower, which leads to the pollutants staying on the ground and unable to be discharged in time. The third is the increase of suspended particulate matter. In recent years, with the development of industry, the increase of motor vehicles, the emission of environmental pollutants and the large increase of hovering objects in the city, the whole city looks gloomy and dull directly. The formation of smog is closely related to pollutant discharge. Micron fine particles emitted by motor vehicle exhaust and other smoke and dust emission sources in urban areas. Dust will be formed when adverse weather such as inversion temperature and static wind occurs. There are four regions with relatively serious haze weather in China: Huanghuaihai region, Yangtze River basin, Sichuan basin and Pearl River Delta. Haze weather hazards: Fog or haze is disastrous weather, which has an important impact on roads, railways, aviation, aviation, power supply systems and crop growth. Fog and haze will cause air quality decline, affect the ecological environment and bring great harm to human health. Hazy weather often carries bacteria and viruses in the air, which easily leads to the spread of infectious diseases and various diseases. . Urban air pollutants are not easy to diffuse, which will increase the toxicity of sulfur dioxide, carbon monoxide, nitrogen oxides and other substances and endanger human health. Fog and haze weather in winter may form poisonous fog such as smog or black smoke, which seriously threatens human life and health. Due to the increase of air pollutants caused by human activities, the frequency and intensity of smog in some areas such as industrial areas and urban centers in China are increasing. Ps: Haze is a general term for fog and haze, but the meanings of fog and haze are different. Fog is an aerosol system composed of a large number of tiny water masses or ice crystals suspended in the near-surface air, which mostly appears in autumn and winter and is the product of water vapor condensation in the near-surface air. Haze is an aggregate of a large number of tiny dust particles, smoke particles or salt particles suspended in the atmosphere, which makes the air turbid and reduces the horizontal visibility to below 10km. This is a weather phenomenon.