Causes and hazards of smog formation

① Automobile exhaust. Automobile exhaust is the main component of smog particles.

(2) Waste gas generated by burning coal for heating in winter in the north.

(3) Waste gas discharged from industrial production. For example, metallurgy, kilns and boilers, electromechanical manufacturing, automobile repair and paint and building materials production produce a lot of waste gas from kiln combustion.

④ Dust generated by construction sites and road traffic.

⑤ Particles can grow, and the particle size of bacteria and viruses is equivalent to PM 0. 1 ~ PM 2.5. When the humidity and temperature in the air are appropriate, microorganisms will attach to particles, especially soot particles, and microorganisms will absorb oil droplets and transform them into more microorganisms, which will increase the growth of biotoxic substances in smog.

⑥ Dust "smog" will also be produced in home decoration. Indoor dust is pervasive, which is not only harmful to the health of staff and users, but also increases the cleaning burden. When the dust is serious, it also brings many hidden dangers to the decoration project.

2. Climatic reasons

① The phenomenon of static wind in the horizontal direction increases. The higher the buildings are built in the city, the obstruction and friction of airflow passing through the urban area will be obviously weakened. The increase of static wind phenomenon is not conducive to the diffusion and dilution of suspended particles in the atmosphere, and it is easy to accumulate around urban areas and suburbs.

② The inversion temperature appears in the vertical direction. The inversion layer is like a pot cover over a city. This inversion phenomenon that the upper air temperature is higher than the lower air temperature limits the vertical movement of the lower air, making it difficult for suspended particles in the air to drift to the upper air and be blocked at the lower air and near the ground.

③ The increase of suspended particles and organic pollutants in the air. With the growth of urban population and industrial development, the number of motor vehicles has surged, resulting in a large increase in pollutant emissions and suspended solids.

The influence of haze weather

1. Harm to human body

Haze can affect people's respiratory system, causing acute rhinitis and acute bronchitis. For patients with chronic respiratory diseases such as bronchial asthma, chronic bronchitis, obstructive emphysema, and chronic obstructive pulmonary disease, smog weather will make the condition acute or acute.

② Haze days have a serious impact on cardiovascular and cerebrovascular diseases, which will hinder normal blood circulation and lead to cardiovascular diseases, hypertension and coronary heart disease.

(3) Hazy weather will also lead to the weakening of ultraviolet rays in the surface layer, which can enhance the activity of infectious bacteria in the air and increase infectious diseases.

4 smog is not conducive to children's growth. In foggy days, due to the decrease of sunshine, insufficient ultraviolet radiation for children, insufficient production of vitamin D in the body, and greatly reduced absorption of calcium, rickets in infants and young children will be seriously caused, which will slow down the growth and development of children.

2. Impact on ecological environment and traffic.

① In foggy days, traffic jams and traffic accidents are easily caused due to poor air quality and low visibility. In daily driving, you should observe the road conditions to avoid danger.

② In foggy weather, the light is seriously insufficient, and the ultraviolet rays near the bottom are obviously weakened, so it is difficult to kill the bacteria in the air, thus greatly increasing the probability of suffering from infectious diseases.

③ Haze weather has an important impact on roads, railways, aviation, shipping, power supply system and crop growth. Fog and haze will cause air quality decline, affect the ecological environment and bring great harm to human health.