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Chinese Agricultural Science Bulletin ›› 2019, Vol. 35 ›› Issue (2): 100-103.doi: 10.11924/j.issn.1000-6850.casb18020072

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Scavenging Effect of Rainfall on PM2.5 and O3 in Urban Area of Xianning: A Preliminary Analysis

  

  • Received:2018-02-23 Revised:2018-12-24 Accepted:2018-05-25 Online:2019-01-11 Published:2019-01-11

Abstract: To study the influence of rainfall on mass concentration of PM2.5 and O3 in urban areas, we analyzed 211 rainfall data from January 2015 to December 2016 in Xianning by analyzing the relation between scavenging efficiency and rainfall time, total rainfall amount and the mass concentration of PM2.5 and O3 before rainfall. The results showed that the scavenging effect increased with the increase of rainfall intensity, time of duration and total amount, in case of lower mass concentration of PM2.5 and O3 before rainfall, the scavenging effect was not so obvious; in case of higher mass concentration of PM2.5 and O3 before rainfall, rainfall had obvious scavenging effect on them. In conclusion: when the rainfall amount is greater than 5.0 mm and the mass concentration of PM2.5 and O3 are greater than 65 μg/m3, the scavenging effect of rainfall is more obvious with the increase of rainfall amount.