Spatial Correlation Analysis of Urban Air Quality Index in Henan Province

Abstract

Urban air pollution is an urgent problem to be solved in the process of China's economic development and urbanization process. Based on the daily average data of urban air quality in Henan province in 2017, using geostatistical analysis and spatial analysis methods, this paper studies the temporal distribution characteristics and spatial correlation of air quality of the cities in the province. The results show that: The urban air quality of northern cities in the province is significantly lower than that of southern cities, Anyang, Zhengzhou and Luoyang are the regions with the worst air quality, where the air quality index varies greatly with the most days of severe pollution; The urban air quality index shows weekend effect, and the air quality index in weekend is obvious high. The urban air quality index also presents the characteristics of seasonal changes, which decreases gradually from winter to autumn. There are some positive correlations among the urban air qualities, these correlations are significant in the summer and autumn. The cities with high air pollution have been aggregating, the urban air quality index gradually declines from spring to autumn with the significant regional variation, the improvement of air quality in the central and northern cities is significantly lower than that in the southern regions, and gradually forms high pollution aggregation regions.