Spatial and temporal patterns of ozone pollution and its influencing factors in China in 2019
Based on hourly ozone monitoring data from 1836 monitoring stations in 338 cities in China,this study investigates the spatial and temporal characteristics of ozone concentration variation in different climatic zones,and reveals the relative contributions of natural and social factors to ozone pollution in different climat-ic zones and their key influencing factors.The results show that the annual evaluated values of ozone concen-tration in Chinese cities range from 84 to 193 µg/m3,with an annual average concentration of 141 µg/m3 and good urban air quality.However,22%of the cities in China still exceeded the annual ozone assessment value,accounting for about 6%of the total number of days in the year.Urban ozone pollution has a strong spatial het-erogeneity,temperate climate zone urban ozone pollution is the most serious,exceeds the standard city up to 44%,the average number of days exceeded about 10%of the year,ozone concentration level is light pollution,(Jinan,Zibo and Binzhou,etc.);The ozone concentration standard in the arid and semi-arid climate zone was excellent,with only 1%of the days of the year exceeding the standard.Urban ozone concentrations have strong seasonal characteristics,generally higher in spring and summer than in autumn and winter.Average ozone con-centrations are highest in summer(109 µg/m3),followed by spring(108 µg/m3)and autumn(86 µg/m3),and lowest in winter(67 µg/m3).Redundancy analysis shows that social factors(PM2.5 and GDP etc.)are the main factors influencing the increase or decrease of urban ozone concentrations,with natural factors playing a sec-ondary role.There is significant variability in the influence of natural and social factors on ozone in different climatic zones.This study can provide important theoretical support for cities in China to effectively cope with ozone pollution and build livable cities.
万方数据
维普
