"The 2021 Project of Chemical Speciation Monitoring and Analysis
「"The 2021 Project of Chemical Speciation Monitoring and Analysis」於資料集「EPQSummary_EnvironmentalMonitoringAndTesting」由單位「行政院環境保護署」的陳先生所提供，聯繫電話是02-2311-7722#2386，最近更新時間為：2023-07-30 01:01:45。 欄位Project Title的內容是"The 2021 Project of Chemical Speciation Monitoring and Analysis of Fine Particulate Matter (PM2.5)" ， 欄位Project Subject的內容是"This project collected PM2.5 simultaneously at the Banqiao, Zhongming, Douliu, Chiayi, Xiaogang, and Hualien sites of the Environmental Protection Administration (EPA) once every six days. Moreover, near-traffic-source samplings were conducted at the Datung site in Taipei city and the Taiwan Boulevard site in Taichung city. The collected samples were analyzed for PM2.5 mass concentrations, water-soluble inorganic ions, carbonaceous contents, and metal elements to derive pollution causes and source contributions. Meanwhile, factors influencing atmospheric visibility were also studied to provide environmental protection institutions for setting up their control measures.
The regular sampling results of PM2.5 mass concentrations were consistent with the EPA’s routine sampling by other teams without apparent bias. The reconstructed PM2.5 chemical composition fractions ranged from 84 to 93%, which were enough to account for varying characteristics of mass concentrations. Seasonal variations showed that high PM2.5 mass concentrations frequently occurred in winter, gradually decreased in spring, and started increasing in spring. High PM2.5 and NO3- concentrations were still distributed over the sites southward central Taiwan. High NO3- concentrations indicated the significance of controlling their precursor sources. The analyzed metal elements showed markers of boiler combustion or biomass burning particles occurring pervasively at the six sites but with higher concentrations in the southern sites. The OC and EC concentrations from the near-traffic-source samplings at the Taiwan Boulevard and the Datung sites were higher than the nearby regular sites. The measured metal elements were mainly associated with the suspended dust and the abrasion of vehicle components. The metal element concentrations of high health risk, such as Pb, As, and Cd, were not extraordinarily high.
During sampling, the double-filter corrections for the volatilization and absorption of water-soluble inorganic ions and carbonaceous contents were conducted persistently from 2017 to 2021. PM2.5 mass concentrations were prevented from underestimation by 5-8.5% on average after offsetting volatilization and absorption. The variation trend of PM2.5 chemical composition has been used for assessing source control efficacy over the last five years. The rapid decrease of SO42- concentration indicated an effective SOx control, while a slowly decreasing trend of OC concentration might be related to diversified source contributions. The increase of NO3- and other characteristic species implied a significant influence from industrial activities. In contrast, the persistent decrease of EC concentration represented an effective control for Diesel vehicles. The analysis of chemical composition fraction for high PM2.5 concentration showed that eastern and northern Taiwan should improve emissions from mobile sources and sulfur-fuel boilers in winter and spring. As for the areas from central to southern Taiwan, continued control for NOx and VOCs emission sources is necessary. Sulfur-fuel boilers are the main control target in summer and early autumn. Except the Douliu site, the OC and PM2.5 concentrations can be reduced if the mobile sources are effectively controlled. The previous derivation was based on OC were mostly primary from OC apportionment in the recent five years. From the spatial similarity analysis of the various sites, the control of SOx can be similar in all areas, while the control for NOx and VOCs emission sources needs to have diversified control measures and strength at specific locations. For those heavy metals (As, Cd, Cr, and Pb) levied for air pollution fees from 2018, their concentrations had a downward trend but were slightly different from PM2.5. It is noted that the Cd and Cr concentrations at the Xiaogang site are the highest among all sites. In the recen..." ， 欄位Project Year的內容是2021 ， 欄位Organizer的內容是"Department of Environmental Monitoring ＆amp; Information Management" ， 欄位Executive Unit的內容是"國立中央大學" ， 欄位Reporting download URL的內容是https://epq.epa.gov.tw/project/filedownload.aspx?fid=270727 ， 欄位Publish Date的內容是20220301 。
Project Title
"The 2021 Project of Chemical Speciation Monitoring and Analysis of Fine Particulate Matter (PM2.5)"
Project Subject
"This project collected PM2.5 simultaneously at the Banqiao, Zhongming, Douliu, Chiayi, Xiaogang, and Hualien sites of the Environmental Protection Administration (EPA) once every six days. Moreover, near-traffic-source samplings were conducted at the Datung site in Taipei city and the Taiwan Boulevard site in Taichung city. The collected samples were analyzed for PM2.5 mass concentrations, water-soluble inorganic ions, carbonaceous contents, and metal elements to derive pollution causes and source contributions. Meanwhile, factors influencing atmospheric visibility were also studied to provide environmental protection institutions for setting up their control measures. The regular sampling results of PM2.5 mass concentrations were consistent with the EPA’s routine sampling by other teams without apparent bias. The reconstructed PM2.5 chemical composition fractions ranged from 84 to 93%, which were enough to account for varying characteristics of mass concentrations. Seasonal variations showed that high PM2.5 mass concentrations frequently occurred in winter, gradually decreased in spring, and started increasing in spring. High PM2.5 and NO3- concentrations were still distributed over the sites southward central Taiwan. High NO3- concentrations indicated the significance of controlling their precursor sources. The analyzed metal elements showed markers of boiler combustion or biomass burning particles occurring pervasively at the six sites but with higher concentrations in the southern sites. The OC and EC concentrations from the near-traffic-source samplings at the Taiwan Boulevard and the Datung sites were higher than the nearby regular sites. The measured metal elements were mainly associated with the suspended dust and the abrasion of vehicle components. The metal element concentrations of high health risk, such as Pb, As, and Cd, were not extraordinarily high. During sampling, the double-filter corrections for the volatilization and absorption of water-soluble inorganic ions and carbonaceous contents were conducted persistently from 2017 to 2021. PM2.5 mass concentrations were prevented from underestimation by 5-8.5% on average after offsetting volatilization and absorption. The variation trend of PM2.5 chemical composition has been used for assessing source control efficacy over the last five years. The rapid decrease of SO42- concentration indicated an effective SOx control, while a slowly decreasing trend of OC concentration might be related to diversified source contributions. The increase of NO3- and other characteristic species implied a significant influence from industrial activities. In contrast, the persistent decrease of EC concentration represented an effective control for Diesel vehicles. The analysis of chemical composition fraction for high PM2.5 concentration showed that eastern and northern Taiwan should improve emissions from mobile sources and sulfur-fuel boilers in winter and spring. As for the areas from central to southern Taiwan, continued control for NOx and VOCs emission sources is necessary. Sulfur-fuel boilers are the main control target in summer and early autumn. Except the Douliu site, the OC and PM2.5 concentrations can be reduced if the mobile sources are effectively controlled. The previous derivation was based on OC were mostly primary from OC apportionment in the recent five years. From the spatial similarity analysis of the various sites, the control of SOx can be similar in all areas, while the control for NOx and VOCs emission sources needs to have diversified control measures and strength at specific locations. For those heavy metals (As, Cd, Cr, and Pb) levied for air pollution fees from 2018, their concentrations had a downward trend but were slightly different from PM2.5. It is noted that the Cd and Cr concentrations at the Xiaogang site are the highest among all sites. In the recen..."
Project Year
2021
Organizer
"Department of Environmental Monitoring ＆amp; Information Management"
Executive Unit
"國立中央大學"
Reporting download URL
Publish Date
20220301
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