It was studied based on the ozone hour data of 11 urban districts in Jiangxi province from 2015 to 2020 that the temporal and spatial characteristics of ground-level ozone(O3)in Jiangxi province since the ten-point plan of action on the prevention and control of air pollution and the three-year action plan for winning the blue sky defense.Analysis on ozone pollution causes was discussed in combination with other gaseous pollutants and mete-orological factors by using mathematical statistics analyses.The results showed that the average annual growth rate of O3 MDA8 in Jiangxi province was 3.95％,and the concentration increased by 2.57 pg/(m3·a).Monthly variations of O3 MDA8 concentrations reached the peak in May and September,respectively.The hour ozone con-centrations peaked at 15:00.The average annual concentration of O3 MDA8 was the highest in Yingtan among 11 cities with a value of 147.6 μg/m3.But the increment was the largest in Xinyu,whose value was 9.94％.It was found that O3 accumulation was easily promoted under meteorological conditions such as long sunshine time,high temperature,low relative humidity(RH),little rain,and low pressure by analysis of variance and Spearman cor-relation analysis.The concentrations of O3 MDA8,photochemical total oxidant,and sunlight hours were 2.13 times,1.79 times and 2.22 times on the polluted day of that on the clean day,respectively.Ozone was positively correlated with O3 precursors(for example NO2 and CO),while it was significantly negatively correlated with RH and precipitation.These results indicated that O3 pollution was greatly affected by atmospheric oxidation,O3 pre-cursor emissions,and meteorological factors(such as sunshine,RH,and precipitation).
关键词
O3/时空污染特征/气态污染物/气象因素/大气氧化性
Key words
O3/temporal and spatial characteristics/gaseous pollutants/meteorological factors/atmospheric oxi-dation
维普
万方数据