Temporal And Spatial Characteristics Of PM 2.5 And PM 10 In The Yangtze River Delta Urban Agglomeration And Air Quality Assessment

With the rapid development of China's economy and the accelerating process of urbanization,various "urban diseases" have become an important factor limiting the further development of the city.Urban air pollution caused by urbanization and industrialization,a large number of urban construction dust,and automobile exhaust emissions and other issues that cause urban air pollution are becoming the main reasons that endanger public health and safety and affect the development of urban ecological health.The "haze " weather disasters caused by the major pollutants PM2.5 and PM10 have increasingly attracted wide attention from the academia and the public and have become the current research hotspot issues.As one of the three major urban agglomerations in China today,the Yangtze River Delta urban agglomeration is an important engine for China's economic development in the future.However,in recent years,atmospheric pollution with PM2.5 and PM10 as the main pollutants has severely limited the ecological security and economic development of the Yangtze River Delta urban agglomeration.According to the "Development Plan of the Yangtze River Delta urban agglomeration " issued by the China State Council,this article crawled the hourly data of six major atmospheric pollutants in 26 prefecture-level cities from March 1,2016 to February 28,2017 through big data.Used with Excel,SPSS 20.0 software to clean up the relevant data,statistical calculations obtained PM2.5,PM10 daily average data,and statistical analysis of pollutant data characteristics.On the time scale,i analyze the variation of PM2.5 and PM10 pollution by plotting the characteristic curve of PM2.5,PM10 pollutants changing day by day,month by mouth,and season by season.The results showed that the PM2.5 and PM10 pollution in the Yangtze River Delta urban agglomeration generally showed a trend of high in winter and spring,low in summer and autumn,and the results of research on air pollution related to other cities in China were basically the same;Within 12 months of the year,the lowest monthly average of PM2.5 in 26 cities was in August 2016,while the lowest monthly average of PM10 was mostly in September 2016.On the other hand,the highest monthly PM2.5 pollution value appeared in 16 cities in January 2017,accounting for Of the total number of 61.54%,PM10 has the highest values of 13 cities appearing in December 2016 and January 2017.Using Arc GIS10.2 software,combined with geostatistics,spatial autocorrelation and other relevant theories,I plotted the spatial transfer trends and distribution characteristics of PM2.5 and PM10 pollutants to provide scientific suggestion for the control of atmospheric pollution in the Yangtze River Delta urban agglomeration.The analysis results show that there are significant spatial differences in PM2.5 and PM10 pollution in the urban agglomerations of the Yangtze River Delta.The main manifestations are the high pollution values in the central and northern regions of the urban agglomeration.Many cities tend to agglomerate to form highly polluting centers,and spread to contiguous areas,while in the southeast and northeast,due to the proximity to the coast,they are affected by the monsoon climate,and the pollution values are low;PM2.5 and PM10 high-pollution areas are spatially characterized by migration over time.High-value centers emerged from random areas in Hefei,Zhenjiang Taizhou,Yangzhou,and Anqing,but low-value centers were relatively stable,mainly in Taizhou and Zhoushan,and finally identified focus of prevention and control of the air pollution.According to ?the AQI Technical Regulations(Trial)?(HJ 633-2012),the annual AQI values of the Yangtze River Delta urban agglomeration are calculated,and the atmospheric environmental quality of the year is analyzed in conjunction with the spatial-temporal scale.The results showed that the air quality of 26 cities in the Yangtze River Delta urban agglomeration increased significantly from February 2016 to March 2017.The annual AQI values of 26 cities met the requirements of the secondary standards of the Ministry of Environmental Protection;the spatial distribution of AQI was the same as PM2.5 and PM10.The high values are mainly concentrated in the eight cities of Anhui Province and the central region of Jiangsu Province.The southeastern coastal cities constitute low-value belts,especially in Zhoushan.The average annual value of AQI is only 41.99,which is in line with Class 1 air quality standard.