Why is Dianshan Lake PM2.5 the highest in the city?
Meteorological factors, PM2.5 is closely related to the source of pollutants and meteorological conditions, mainly secondary generation. The 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 It is a sea-land breeze climate. During the day, the wind blows from the ocean to the land to the west of Dianshan Lake, and at night it blows from the land back to the ocean. Dianshan Lake is in the oscillation area at the junction of sea and land breezes. In this process, some pollutants complete secondary transformation, showing pollution For example, the southeast wind mainly blows in Shanghai, and Dianshan Lake is in the downwind direction. It is affected by urban pollutants and secondary generation, resulting in high PM2.5 concentration.
The impact of human activities. With the further acceleration of urbanization, human activities are increasing, among which the pollution caused by traffic is an important factor. In recent years, with the development of surrounding areas and the Shanghai-Qingping National Highway The opening of Qingpu Dianshan Lake has affected the environmental quality of Qingpu to a certain extent. The number of cars entering and exiting Qingpu has continued to increase. According to research by the Shanghai Environmental Protection Department, among the many sources of PM2.5, motor vehicle exhaust pollution cannot be ignored. A large number of diesel vehicles PM2.5 will be produced during road driving, and drivers' bad driving habits such as rapid acceleration and rapid deceleration will also emit more PM2.5.
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The impact of surrounding cities, such as when northwest winds blow in winter, the Dianshan Lake site will also be affected to a certain extent by regional pollution transmission. In this sense, the Dianshan Lake monitoring point plays a very important role as a boundary control point, reflecting the impact of urban economic development on air quality. It is a very good "lesson". This site can reflect two issues. First, It is the influence of sea and land winds on the city. First, it is the mutual influence and transfer process of pollutants from surrounding cities and Shanghai. Therefore, the significance of its boundary comparison point is still very obvious.