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摘要
Based on the air pollutant monitoring data of 4 different types of national-controlled stations from 2015 to 2019 in Guangzhou, the pollution characteristics of particulate matter (PM2.5) and ozone (O3) pollution at each type of station were studied, and the correlation and interaction between PM2.5 and O3 in O3 pollution season and PM2.5 pollution season were further analyzed. The results are as follows: the concentration of PM2.5 at each type of station in Guangzhou generally showed a downward trend from 2015 to 2019, while the O3 concentration showed an upward trend. There is a positive correlation between PM2.5 and O3 concentration in different pollution seasons. In O3 pollution season, the generation of secondary PM2.5 had a more significant impact on particulate matter than the primary PM2.5. With the increase of photochemical level, the contribution concentration of primary PM2.5 basically remained unchanged (all in the range of 21.03~31.37μg/m3), while the contribution rate gradually decreased; However, the contribution concentration of secondary PM2.5 increased in multiple (from 3.51~7.72μg/m3 to 16.04~18.45μg/m3) as well as the contribution rate (from 11%~27% to 34%~44%). Moreover, the contribution of secondary PM2.5 at different types of stations were significantly different, the contribution of secondary PM2.5 was the largest at the background station, while the contribution of secondary PM2.5 was the smallest at the urban station at the medium and the high photochemical level. In PM2.5 pollution season, the O3 concentration at each type of station under different PM2.5 pollution levels was different. Generally, it showed the characteristics of background station > suburban station > urban station. The extinction effect and heterogeneous reaction of aerosol significantly promoted the generation of O3. With the increase of PM2.5 concentration, the peak of O3 concentration at each type of station gradually increased from 62.12~83.82μg/m3 to 92.49~135.4μg/m3, and the peak value of O3 change rate also increased from 8.42~10.02μg/(m3?h) to 21.33~27.04μg/(m3?h), which further promoted the coordinated growth of PM2.5 and O3 concentrations in Guangzhou. ? 2021, Editorial Board of China Environmental Science. All right reserved.
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