Analysis of PM2.5 concentration dynamics and its influencing factors in the Yangtze River Delta based on different city sizes
In terms of economic development,the Yangtze River Delta belongs to one of China's most active,open,and creative regions.However,due to the rapid industrialization,PM2.5 air pollutions in this region have drawn considerable attention.Taking the Yangtze River Delta as our research focus,via remote sensing PM2.5 inversion dataset and methods of spatial clustering analysis and spatial panel models,we investigated the spa-tial-temporal variations of PM2.5 and identifying its key driving factors considering different city sizes.Results founds that:1)From 2000-2018,the average value of PM2.5 in the Yangtze River Delta was around(40.5-59.1)ug/m3,with an overall trend of firstly growing and then decreasing,and the breakpoint appeared in year 2014.2)Over the same time frame,PM2.5 concentration in megacities and medium-sized cities was relatively high and showed an increasing trend,while PM2.5 concentration in other different sized cities was relatively low and showed a decreasing trend,showing the polarization characteristics.3)The Yangtze River Delta's PM2.5 con-centration showed clear spatial aggregation characteristics.The high-high PM2.5 concentration areas were dis-tributed in the northeastern sector,and their concentration range continued to shrink.The low-low PM2.5 con-centration areas were shifted from the Jiangsu Province to Zhejiang Province.4)The Yangtze River Delta's PM2.5 concentration showed a spatial spillover impact.The proportion of secondary industry ranked as the first driving factor influencing PM2.5 concentration,followed by the proportion of tertiary industry,while the urban-ization rate,GDP and the proportion of built-up areas have weak influence.
PM2.5spatial autocorrelationspatial panel modelsthe Yangtze River Delta
万方数据
