Abstract:
From the perspective of Geonomy, based on land use, population, traffic, terrain factors, the average concentration of PM2.5 in 2014 and 2015 heating season in the main urban area of Xi′an city was simulated.Then the causes of the spatial distribution and the reason of annual variation of PM2.5 average concentration were analyzed.The results showed the main variables selected in LUR model in 2014 are 500 m buffer area of vegetation, 1 000 m buffer area of vegetation, population and population density. The main variables selected in LUR model in 2015 are the total length of the road in 1 500 m, 2 000 m, 2 500 m and 3 000 m buffer.The regression coefficients of R2 in LUR model were 0.933 and 0.832, respectively in 2014 and 2015, and the fitting effect is very good. The average concentration of PM2.5 was higher in 2014 heating season. The air quality in most Beilin district was very serious and Xincheng district was the second. The other area′s air quality is heavily polluted. In 2015, the average concentration of PM2.5 in all urban areas decreased, and most of them were slightly polluted.The land use types, pollution sources, traffic, population density, national policy on environmental protection, wind direction, and DEM are the main influencing factors.
