This paper focused on the analysis of O3 pollution and its influencing factors in cities in different regions of China.The results showed that the concentration of O3 and PM2.5 in northern cities(Shijiazhuang and Zhengzhou)were negatively correlated in winter and positively correlated in other seasons while the central and southern cities(Jingmen and Ganzhou)were generally positively correlated throughout the year.In months with significant O3 pollution,the interannual concentrations of O3 and PM2.5 showed a synergistic trend.From May to September 2022,there was a positive correlation between O3 and NO2 from 0 to 6 o'clock In four cities,NO2 concentration on the day when O3 exceeded the standard was significantly higher than that in standard days.The NO2 sensitive inflection point mass concentrations in Shijiazhuang,Zhengzhou,Jingmen and Ganzhou were respectively 32,24,17 and 14 µg/m3.If the NO2 concentration could be reduced below the sensitive point,and the O3 pollution might be improved.
万方数据