Traditional Culture Encyclopedia - Weather forecast - Why is pm2.5 the highest in Dianshan Lake?

Why is pm2.5 the highest in Dianshan Lake?

Meteorological factors, PM2.5 is closely related to pollutant sources and meteorological conditions, mainly secondary generation. Dianshan Lake monitoring point is located at the junction of Jiangsu, Zhejiang and Shanghai, downwind of the dominant wind direction in Shanghai in summer. Shanghai has a land-sea breeze climate. During the day, the wind blows from the sea to the west of Dianshan Lake and from the land back to the sea at night. Dianshan Lake is located in the area where the land-sea wind fluctuates back and forth. In this process, some pollutants are transformed twice, showing the superposition of pollutants. For example, Shanghai mainly blows southeast winds.

The influence of human activities, with the further acceleration of urbanization, human activities are increasing day by day, among which traffic pollution is an important factor. In recent years, with the development of the surrounding areas and the opening of the Shanghai-Qingdao Equal National Road, the environmental quality of Dianshan Lake in Qingpu has been affected to some extent, and the number of cars entering and leaving Qingpu has been increasing. According to the research of Shanghai environmental protection department, among the many sources of PM2.5, motor vehicle exhaust pollution can not be ignored, and a large number of diesel vehicles will produce PM2.5 when driving on the road.

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The influence of surrounding cities, such as when the northwest wind blows in winter, Dianshan Lake site will also be affected by regional pollution transmission to a certain extent. In this sense, the monitoring point of Dianshan Lake plays a very important role as a border control point, reflecting the impact of urban economic development on air quality, which is a very good "lesson". This site can reflect two problems, one is the influence of land and sea breeze on the city, and the other is the interaction and transfer process of pollutants between surrounding cities and Shanghai. Therefore, the significance of its boundary control points is still obvious.