"Effect of Atmosphere Particle Properties to Visbility"2017"Visi
「"Effect of Atmosphere Particle Properties to Visbility"2017"Visi」於資料集「EPQSummary_Air」由單位「行政院環境保護署」的郭先生所提供，聯繫電話是02-2311-7722 EXT.2399，最近更新時間為：2022-01-15 01:13:50。 欄位Project Title的內容是"Effect of Atmosphere Particle Properties to Visbility" ， 欄位Project Subject的內容是"Visibility is defined as the greatest distance in a given direction at which it is just possible to see and identify a prominent dark object against the skyline with the unaided eye in daytime, visibility degradation is a major problem in atmospheric pollution in many mega cities around the world.
The object of this study was to investigate the correlation of visibility with physical and chemical composition of PM2.5 . The field experiments were conducted in four seasons from November 2017 to July 2018 in Qianjin and Qiaotou. Integrating Nephelometer and AE33 was used to measure the aerosol optical properties and compared with the calculated values based upon the measurements of aerosol concentration, size distribution and chemical composition (NH4NO3, (NH4)2SO4, EC and OC).
The result indicated the relative humidity was above 80%, the particles usually grew into larger size range in fall and summer, but particle concentration and extinction coefficient in fall was higher than that in summer. The extinction coefficient was the sum of scattering coefficient and absorption coefficient. The ratio of scattering coefficient and absorption coefficient were 90% - 95% and 5% - 10% respectively. The results showed that surface area and volume concentration had a great relationship with extinction coefficient. The RSQr of surface area and volume concentration were more than 0.87. (NH4)2SO4 and NH4NO3 measured in size range of 0.46 µm - 0.7 µm (Qianjin) and 0.3 µm - 0.45 µm (Qiaotou) respectively. The concentration of (NH4)2SO4 and NH4NO3 in Qianjin was higher than in Qiaotou, and the size range were in the visible region between 0.4 µm and 0.7 µm, thus the visibility in Qianjin was lower than in Qiaotou." ， 欄位Project Year的內容是2017 ， 欄位Organizer的內容是"Department of Air Quality Protection ＆amp; Noise Control" ， 欄位Executive Unit的內容是"國立臺北科技大學" ， 欄位Reporting download URL的內容是https://epq.epa.gov.tw/project/filedownload.aspx?fid=175653 ， 欄位Publish Date的內容是20181201 。
Project Title
"Effect of Atmosphere Particle Properties to Visbility"
Project Subject
"Visibility is defined as the greatest distance in a given direction at which it is just possible to see and identify a prominent dark object against the skyline with the unaided eye in daytime, visibility degradation is a major problem in atmospheric pollution in many mega cities around the world. The object of this study was to investigate the correlation of visibility with physical and chemical composition of PM2.5 . The field experiments were conducted in four seasons from November 2017 to July 2018 in Qianjin and Qiaotou. Integrating Nephelometer and AE33 was used to measure the aerosol optical properties and compared with the calculated values based upon the measurements of aerosol concentration, size distribution and chemical composition (NH4NO3, (NH4)2SO4, EC and OC). The result indicated the relative humidity was above 80%, the particles usually grew into larger size range in fall and summer, but particle concentration and extinction coefficient in fall was higher than that in summer. The extinction coefficient was the sum of scattering coefficient and absorption coefficient. The ratio of scattering coefficient and absorption coefficient were 90% - 95% and 5% - 10% respectively. The results showed that surface area and volume concentration had a great relationship with extinction coefficient. The RSQr of surface area and volume concentration were more than 0.87. (NH4)2SO4 and NH4NO3 measured in size range of 0.46 µm - 0.7 µm (Qianjin) and 0.3 µm - 0.45 µm (Qiaotou) respectively. The concentration of (NH4)2SO4 and NH4NO3 in Qianjin was higher than in Qiaotou, and the size range were in the visible region between 0.4 µm and 0.7 µm, thus the visibility in Qianjin was lower than in Qiaotou."
Project Year
2017
Organizer
"Department of Air Quality Protection ＆amp; Noise Control"
Executive Unit
"國立臺北科技大學"
Reporting download URL
Publish Date
20181201
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