Temporal And Spatial Variation Characteristics And Influencing Factors Of Urban Air Quality In Guangxi

In recent years,with the accelerated process of urbanization in Guangxi and the rise of industrial modernization,the pollution caused by the air environment in Guangxi is becoming more and more serious,and it is more obvious in cities with relatively dense population and relatively high economic level.As a multi country forest city and a national environmental protection model city,the quality of air has been paid much attention to,but the phenomenon of continuous decline in air quality has appeared recently,and the characteristics of complex low altitude pollution,which are mainly industrial pollution,urban dust and automobile exhaust pollution,have also been presented.According to the results published by the environmental protection departments at all levels,there are many factors affecting the air quality factors in Guangxi,the geographical environment and the acceleration of the industrialization process of industrialization,which are the important factors that affect the air quality.Therefore,it is necessary to study the spatial and temporal characteristics of Guangxi air quality and its influencing factors,which can not only recognize the status of the air quality,the process of change and the trend of its development in Guangxi,but also help the relevant government departments to formulate effective air quality monitoring and control methods and measures.At present,all the cities in Guangxi have reported the air quality status to the public with the ambient air quality index data.This paper first selects the monthly average air quality index of Guangxi and 14 cities from January 2015 to December 2017 as the original data,and uses the GeoDa software to analyze the spatial and temporal variation characteristics of air quality in the whole area and 14 cities.It is found that the air quality in Guangxi is greatly influenced by the seasonal changes,and the air quality in summer is obviously better than that in winter,and the air quality in the southwest of Guangxi is better than that in the northeast of Guangxi.It can be seen from the close analysis that the overall air quality index of the Guangxi region in the last three years(excluding the spring of 2016)has a significant positive spatial correlation.According to the local spatial autocorrelation analysis,the city is significantly related to the surrounding cities in the four quarters of the three years,and the main performance is high(H-H)and low(L-H)two spatial agglomeration structures.Then,the factors affecting the air quality of Guangxi city are analyzed from the aspects of geographical environment and human factors,and the fiscal revenue,the number of permanent residents,the number of fixed assets investment,the location of each city,the car ownership of each city and the various cities in each city in 2015 and 2016 are collected.The spatial error model and space lag model are established for two years,and the results show that the data of 2015 and 2016 have passed the space effect test,and the space lag model is more suitable for 2015,and the space error model is more suitable for the 2016.Finally,based on the above conclusions,suggestions are put forward for improving air quality in Guangxi.