Influence of Secondary Inorganic Aerosol on the Concentrations of PM2.5 and PM0.1 during Air Pollution Episodes in Hanoi, Vietnam
Abstract The high concentration of PM2.5 in Hanoi has been an issue of great concern. There were several periods during the winter when PM2.5 concentrations were higher than the Vietnamese ambient air quality standards (NAAQS) and WHO guidelines for daily PM2.5. In this study, the periods when daily...
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| Format: | Article |
| Language: | English |
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Springer
2024-02-01
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| Series: | Aerosol and Air Quality Research |
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| Online Access: | https://doi.org/10.4209/aaqr.220446 |
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| author | Nguyen-Quoc Dat Bich-Thuy Ly Trung-Dung Nghiem Thu-Thi Hien Nguyen Kazuhiko Sekiguchi Truong-Thi Huyen Thai-Ha Vinh Le-Quang Tien |
| author_facet | Nguyen-Quoc Dat Bich-Thuy Ly Trung-Dung Nghiem Thu-Thi Hien Nguyen Kazuhiko Sekiguchi Truong-Thi Huyen Thai-Ha Vinh Le-Quang Tien |
| author_sort | Nguyen-Quoc Dat |
| collection | DOAJ |
| description | Abstract The high concentration of PM2.5 in Hanoi has been an issue of great concern. There were several periods during the winter when PM2.5 concentrations were higher than the Vietnamese ambient air quality standards (NAAQS) and WHO guidelines for daily PM2.5. In this study, the periods when daily PM2.5 concentrations exceeded the NAAQS of 50 µg m−3 for a minimum of two consecutive days were determined as episode periods. The study focuses on the impact of secondary inorganic aerosol (SIA) on PM2.5 episodes in the dry winter period in Hanoi. To calculate SIA, water-soluble ions of daily PM2.5 and PM0.1 samples which were collected on the rooftop of a three-storeyed building at an urban site in Hanoi, Vietnam (HUST site) from October 14 to December 31, 2020, were analyzed. Levels and SIA of PM2.5 and PM0.1 at a transportation site (CEM site) in an episode period from December 20 to December 28, 2020 were also measured. The contribution of SIA on PM2.5 and PM0.1 during those episodes, the effects of meteorological conditions, and long-range transport were investigated. The results showed that SIA contributed on average 29.0% and 14.1%, respectively, to PM2.5 and PM0.1 concentrations during air pollution episodes at HUST. Those were higher than the average contribution percentages of total SIA to PM concentrations in non-episode periods for PM2.5 (25.6%) and PM0.1 (10.6%) at HUST. Among meteorological factors, wind speed largely affected PM2.5 concentration and SIA of PM2.5. Relative humidity, pressure, temperature, and radiation had a good correlation with SIA of PM0.1 and a moderate correlation with PM0.1. Concentration-weighted trajectory analysis demonstrated that PM2.5 and SIA levels were also influenced by long-range transportation from the upper areas. This study highlighted the importance and served as pioneered research on SIA contribution to PM2.5 episodes in the country. |
| format | Article |
| id | doaj-art-dc1ea1d628e84d2193db0db865b26f68 |
| institution | Kabale University |
| issn | 1680-8584 2071-1409 |
| language | English |
| publishDate | 2024-02-01 |
| publisher | Springer |
| record_format | Article |
| series | Aerosol and Air Quality Research |
| spelling | doaj-art-dc1ea1d628e84d2193db0db865b26f682025-02-09T12:23:36ZengSpringerAerosol and Air Quality Research1680-85842071-14092024-02-0124411510.4209/aaqr.220446Influence of Secondary Inorganic Aerosol on the Concentrations of PM2.5 and PM0.1 during Air Pollution Episodes in Hanoi, VietnamNguyen-Quoc Dat0Bich-Thuy Ly1Trung-Dung Nghiem2Thu-Thi Hien Nguyen3Kazuhiko Sekiguchi4Truong-Thi Huyen5Thai-Ha Vinh6Le-Quang Tien7School of Chemistry and Life Sciences, Hanoi University of Science and TechnologySchool of Chemistry and Life Sciences, Hanoi University of Science and TechnologySchool of Chemistry and Life Sciences, Hanoi University of Science and TechnologySchool of Chemistry and Life Sciences, Hanoi University of Science and TechnologyGraduate School of Science and Engineering, Saitama UniversityGraduate School of Science and Engineering, Saitama UniversityVietnam National Institute of Occupational Safety and HealthNorth Center of Environmental MonitoringAbstract The high concentration of PM2.5 in Hanoi has been an issue of great concern. There were several periods during the winter when PM2.5 concentrations were higher than the Vietnamese ambient air quality standards (NAAQS) and WHO guidelines for daily PM2.5. In this study, the periods when daily PM2.5 concentrations exceeded the NAAQS of 50 µg m−3 for a minimum of two consecutive days were determined as episode periods. The study focuses on the impact of secondary inorganic aerosol (SIA) on PM2.5 episodes in the dry winter period in Hanoi. To calculate SIA, water-soluble ions of daily PM2.5 and PM0.1 samples which were collected on the rooftop of a three-storeyed building at an urban site in Hanoi, Vietnam (HUST site) from October 14 to December 31, 2020, were analyzed. Levels and SIA of PM2.5 and PM0.1 at a transportation site (CEM site) in an episode period from December 20 to December 28, 2020 were also measured. The contribution of SIA on PM2.5 and PM0.1 during those episodes, the effects of meteorological conditions, and long-range transport were investigated. The results showed that SIA contributed on average 29.0% and 14.1%, respectively, to PM2.5 and PM0.1 concentrations during air pollution episodes at HUST. Those were higher than the average contribution percentages of total SIA to PM concentrations in non-episode periods for PM2.5 (25.6%) and PM0.1 (10.6%) at HUST. Among meteorological factors, wind speed largely affected PM2.5 concentration and SIA of PM2.5. Relative humidity, pressure, temperature, and radiation had a good correlation with SIA of PM0.1 and a moderate correlation with PM0.1. Concentration-weighted trajectory analysis demonstrated that PM2.5 and SIA levels were also influenced by long-range transportation from the upper areas. This study highlighted the importance and served as pioneered research on SIA contribution to PM2.5 episodes in the country.https://doi.org/10.4209/aaqr.220446SIAPM2.5PM0.1Air pollution episodesHanoi |
| spellingShingle | Nguyen-Quoc Dat Bich-Thuy Ly Trung-Dung Nghiem Thu-Thi Hien Nguyen Kazuhiko Sekiguchi Truong-Thi Huyen Thai-Ha Vinh Le-Quang Tien Influence of Secondary Inorganic Aerosol on the Concentrations of PM2.5 and PM0.1 during Air Pollution Episodes in Hanoi, Vietnam Aerosol and Air Quality Research SIA PM2.5 PM0.1 Air pollution episodes Hanoi |
| title | Influence of Secondary Inorganic Aerosol on the Concentrations of PM2.5 and PM0.1 during Air Pollution Episodes in Hanoi, Vietnam |
| title_full | Influence of Secondary Inorganic Aerosol on the Concentrations of PM2.5 and PM0.1 during Air Pollution Episodes in Hanoi, Vietnam |
| title_fullStr | Influence of Secondary Inorganic Aerosol on the Concentrations of PM2.5 and PM0.1 during Air Pollution Episodes in Hanoi, Vietnam |
| title_full_unstemmed | Influence of Secondary Inorganic Aerosol on the Concentrations of PM2.5 and PM0.1 during Air Pollution Episodes in Hanoi, Vietnam |
| title_short | Influence of Secondary Inorganic Aerosol on the Concentrations of PM2.5 and PM0.1 during Air Pollution Episodes in Hanoi, Vietnam |
| title_sort | influence of secondary inorganic aerosol on the concentrations of pm2 5 and pm0 1 during air pollution episodes in hanoi vietnam |
| topic | SIA PM2.5 PM0.1 Air pollution episodes Hanoi |
| url | https://doi.org/10.4209/aaqr.220446 |
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