Effects of Precipitation on the Air Quality Index, PM2.5 Levels and on the Dry Deposition of PCDD/Fs in the Ambient Air
Abstract The effects of 9 precipitation events in Suzhou City in Anhui Province, China, on the air quality index (AQI), PM2.5, and dry deposition flux of PCDD/Fs (polydibenzo-p-dioxins and polydibenzofurans) were investigated. A total of 7 precipitation events were positive contributes to the reduct...
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| Format: | Article |
| Language: | English |
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Springer
2023-03-01
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| Series: | Aerosol and Air Quality Research |
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| Online Access: | https://doi.org/10.4209/aaqr.220417 |
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| author | Ruoxin Wang Kangping Cui Hwey-Lin Sheu Lin-Chi Wang Xueyan Liu |
| author_facet | Ruoxin Wang Kangping Cui Hwey-Lin Sheu Lin-Chi Wang Xueyan Liu |
| author_sort | Ruoxin Wang |
| collection | DOAJ |
| description | Abstract The effects of 9 precipitation events in Suzhou City in Anhui Province, China, on the air quality index (AQI), PM2.5, and dry deposition flux of PCDD/Fs (polydibenzo-p-dioxins and polydibenzofurans) were investigated. A total of 7 precipitation events were positive contributes to the reduction of AQI; among them, the AQI were between 23 and 216, with an average of 75, the PM2.5 concentrations were between 5.0 and 169 µg m−3, with an average of 25 µg m−3, while the total- PCDD/F-TEQ dry deposition flux ranged from 149 to 1034 pg WHO2005-TEQ m−2 day−1 and averaged 315 pg WHO2005-TEQ m−2 day−1. By comparing the average AQI and PM2.5, respectively, during and after rainfall with that before rainfall, the results indicated that the average reduction fractions of AQI were 26% and 44%, respectively, while those of PM2.5 were 58% and 43%. In addition, the effect of precipitation on the average reduction fraction of total PCDD/F-TEQ dry deposition flux was 31%. However, in the other 2 AQI elevation events, the AQI were between 23 and 100, and averaged 51; when comparing the average AQI and PM2.5 concentrations, during and after the rain with that before the rain, the increases in AQI were 42% and 49%, respectively, while the increases in PM2.5 concentration were 26% and 29%, respectively. The above results show that, on the whole, rain and snow improved the air quality. This is because rainwater removes particles or dissolved gaseous pollutants from the atmosphere and brings aerosols to the ground. However, in some cases, the increase of source emissions and atmospheric vertical convection, the effect of precipitation or air humidity increased the AQI and elevated the concentration of PM2.5, and dry deposition flux of PCDD/Fs. The results of this study provide useful information for both scientific communities and air quality management. |
| format | Article |
| id | doaj-art-ba08cc6a132f486a8b46c4d03956303f |
| institution | Kabale University |
| issn | 1680-8584 2071-1409 |
| language | English |
| publishDate | 2023-03-01 |
| publisher | Springer |
| record_format | Article |
| series | Aerosol and Air Quality Research |
| spelling | doaj-art-ba08cc6a132f486a8b46c4d03956303f2025-02-09T12:21:51ZengSpringerAerosol and Air Quality Research1680-85842071-14092023-03-0123411410.4209/aaqr.220417Effects of Precipitation on the Air Quality Index, PM2.5 Levels and on the Dry Deposition of PCDD/Fs in the Ambient AirRuoxin Wang0Kangping Cui1Hwey-Lin Sheu2Lin-Chi Wang3Xueyan Liu4School of Resources and Environmental Engineering, Hefei University of TechnologySchool of Resources and Environmental Engineering, Hefei University of TechnologyDepartment of Environmental Engineering, Kun Shan UniversityDepartment of Environmental Engineering, Chung Yuan Christian UniversitySchool of Resources and Environmental Engineering, Hefei University of TechnologyAbstract The effects of 9 precipitation events in Suzhou City in Anhui Province, China, on the air quality index (AQI), PM2.5, and dry deposition flux of PCDD/Fs (polydibenzo-p-dioxins and polydibenzofurans) were investigated. A total of 7 precipitation events were positive contributes to the reduction of AQI; among them, the AQI were between 23 and 216, with an average of 75, the PM2.5 concentrations were between 5.0 and 169 µg m−3, with an average of 25 µg m−3, while the total- PCDD/F-TEQ dry deposition flux ranged from 149 to 1034 pg WHO2005-TEQ m−2 day−1 and averaged 315 pg WHO2005-TEQ m−2 day−1. By comparing the average AQI and PM2.5, respectively, during and after rainfall with that before rainfall, the results indicated that the average reduction fractions of AQI were 26% and 44%, respectively, while those of PM2.5 were 58% and 43%. In addition, the effect of precipitation on the average reduction fraction of total PCDD/F-TEQ dry deposition flux was 31%. However, in the other 2 AQI elevation events, the AQI were between 23 and 100, and averaged 51; when comparing the average AQI and PM2.5 concentrations, during and after the rain with that before the rain, the increases in AQI were 42% and 49%, respectively, while the increases in PM2.5 concentration were 26% and 29%, respectively. The above results show that, on the whole, rain and snow improved the air quality. This is because rainwater removes particles or dissolved gaseous pollutants from the atmosphere and brings aerosols to the ground. However, in some cases, the increase of source emissions and atmospheric vertical convection, the effect of precipitation or air humidity increased the AQI and elevated the concentration of PM2.5, and dry deposition flux of PCDD/Fs. The results of this study provide useful information for both scientific communities and air quality management.https://doi.org/10.4209/aaqr.220417RainSnowAQIPM2.5PCDD/FsDry deposition |
| spellingShingle | Ruoxin Wang Kangping Cui Hwey-Lin Sheu Lin-Chi Wang Xueyan Liu Effects of Precipitation on the Air Quality Index, PM2.5 Levels and on the Dry Deposition of PCDD/Fs in the Ambient Air Aerosol and Air Quality Research Rain Snow AQI PM2.5 PCDD/Fs Dry deposition |
| title | Effects of Precipitation on the Air Quality Index, PM2.5 Levels and on the Dry Deposition of PCDD/Fs in the Ambient Air |
| title_full | Effects of Precipitation on the Air Quality Index, PM2.5 Levels and on the Dry Deposition of PCDD/Fs in the Ambient Air |
| title_fullStr | Effects of Precipitation on the Air Quality Index, PM2.5 Levels and on the Dry Deposition of PCDD/Fs in the Ambient Air |
| title_full_unstemmed | Effects of Precipitation on the Air Quality Index, PM2.5 Levels and on the Dry Deposition of PCDD/Fs in the Ambient Air |
| title_short | Effects of Precipitation on the Air Quality Index, PM2.5 Levels and on the Dry Deposition of PCDD/Fs in the Ambient Air |
| title_sort | effects of precipitation on the air quality index pm2 5 levels and on the dry deposition of pcdd fs in the ambient air |
| topic | Rain Snow AQI PM2.5 PCDD/Fs Dry deposition |
| url | https://doi.org/10.4209/aaqr.220417 |
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