Temporal and spatial distribution characteristics of ozone in Harbin-Changchun urban agglomeration from 2017-2021

Abstract

Abstract: Objective To analyze the temporal and spatial distribution characteristics of ozone（O₃） in Harbin-Changchun urban agglomeration,propose strategies and suggestions for O₃ pollution prevention and control in Harbin-Changchun urban agglomeration on the combination of the influence of temporal factors,spatial factors,meteorological factors,and atmospheric pollutants. Methods The data of inhalable particles（PM₁₀）,fine particulate matter（PM_2.5）,SO₂,CO,O₃,NO₂,and meteorological conditions（temperature,air humidity） were collected from 2017 to 2021 in Harbin-Changchun urban agglomeration,to analyze the temporal and spatial distribution characteristics of O₃ and meteorological factors,and the influence of air pollutants on O₃ concentration. Results From 2017 to 2021,the 90th percentile of daily maximum 8 h average concentration of O₃（O₃-8 h-P₉₀） in Harbin-Changchun urban agglomeration decreased from 133.6 μg/m³ to 119.0 μg/m³,which did not exceed the national secondary standard of Ambient air quality standard（GB 3095-2012）. In 2017,the number of days of O₃ exceeding the standard was the highest. The seasonal characteristics were obvious,the concentrations in spring and summer were higher,while the concentrations in autumn and winter were lower. Except for winter,there were O₃ exceeding standards in other seasons. The monthly average O₃ concentration showed an inverted "V" shape,the O₃ concentration peaked from June to July,and the O₃ concentrations were the lowest in January,November and December. Among 11 cities,the O₃ concentration was high in Siping-Changchun-Jilin as center,and the concentration decreased radially towards the surrounding area. The number of days exceeding the standard in Siping City was the most,which was 102 days. Among the 11 cities,the O₃ concentration was the highest in Siping City and the lowest in Mudanjiang City. The O₃ concentration was negatively correlated with PM_2.5,CO,NO₂ and relative humidity,and extremely positively correlated with temperature,and the differences were statistically significant（all P<0.05）. Conclusion Harbin-Changchun urban agglomeration should focus on the O₃ prevention and control in spring and summer seasons under high temperature and low humidity in Siping,Liaoyuan and Jilin,especially during the period of high O₃ concentration from May to August.

Key words: Ozone, Temporal and spatial distribution, Harbin-Changchun urban agglomeration, Influencing factors

CLC Number:

R122

DONG Xiaotian, HOU Qingze, LU Yan. Temporal and spatial distribution characteristics of ozone in Harbin-Changchun urban agglomeration from 2017-2021. [J]OCCUPATION AND HEALTH, 2023, 39(15): 2108-2113.

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