Influence Of The Spread Of Beijing,Tianjin And Hebei Region On Smog And Haze

At present,China is experiencing the world’s largest and fastest urbanization process,followed by the emergence of a large number of urban sprawl.As one of the three core economic growth poles in China,Beijing-Tianj in-Hebei Urban agglomeration is the representative region of urbanization in north China.In the process of urbanization in Beijing,Tianjin and Hebei,there appeared urban sprawl phenomenon of urban expansion speed greater than population growth,urban sprawl brought traffic pollution,air pollution and green land destruction,especially the "haze" problem over Beijing-Tianjin-Hebei city.The Haze pollution in Beijing-Tianjin-Hebei area has aroused widespread concern in the whole society,how to find the influencing factors of haze and how to control haze from the source is an important concern in the area of Beijing,Tianjin and Hebei.According to the research,it is found that in the past 12 years,the urban agglomeration in the region is becoming more and more serious,and there are different degrees of city sprawl,and the total urban sprawl in Beijing,Tianjin and Hebei is positively correlated with the total haze concentration in Beijing,Tianjin and Hebei,and the correlation coefficient.Therefore,it is necessary to find the relationship between the urban sprawl and haze pollution in Beijing-Tianjin-Hebei region,and to provide the basis for optimizing the urban development path and controlling haze in Beijing-Tianjin-Hebei region.In this paper,the urban sprawl index of Beijing-Tianjin-Hebei city is constructed by synthesizing the surface concentration data of Beijing-Tianjin-Hebei PM2.5,urban population data of Beijing-Tianjin-Hebei,urban area data of Beijing-Tianjin-Hebei city and economic statistic data.In this paper,the autocorrelation coefficients of the spatial distribution of urban haze pollution are calculated by using global and local Moran indices,and the spatial distribution characteristics and changes of fog pollution in cities are obtained by the map of the high-high agglomeration region and the low-low concentration region.Based on the analysis of the spatial relativity of Beijing-Tianjin-Hebei Haze,the influence of urban sprawl,urban scale,economic development level,population and industrial structure on fog and haze in Beijing,Tianjin and Hebei are analyzed empirically.The results show that the urban sprawl in Beijing,Tianjin and Hebei will lead to the increase of haze concentration in the environment.However,with the increasing spread of the haze concentration in Beijing,Tianjin and Hebei,after a certain inflection point will fall,showing the "Inverted U-shaped";The larger the urban population in Beijing,Tianjin and Hebei,the worse the haze;the marginal effect of urban sprawl on smog pollution in Beijing,Tianjin and Hebei province is positive,the decrease of the proportion of the second industry in Beijing,Tianjin and Hebei may be offset by the increase in the total amount of secondary.According to the results of the study,the following suggestions are put forward:it is suggested that Beijing,Tianjin and Hebei should establish a joint management mechanism of fog and haze,optimize urban space,reduce urban sprawl,improve public transport,promote the formation of multi-center structure in large cities,and rationally control the population size of large cities.