Concentration variations in primary and secondary particulate matter near a major road in Korea [electronic resource]

• Ngôn ngữ: eng
• Ký hiệu phân loại: 662.8 Other fuels
• Thông tin xuất bản: Argonne, Ill. : Oak Ridge, Tenn. : Argonne National Laboratory ; Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy, 2016
• Mô tả vật lý: Size: p. 32-41 : , digital, PDF file.
• Bộ sưu tập: Metadata
• ID: 264663
• Chủ đề: 1. 09 biomass fuels; 2. 54 environmental sciences; 3. Biomass burning; 4. Fugitive dust; 5. Vehicle emissions

Tóm tắt

 Here, particle-phase concentrations were measured at 10, 80, and 200 m from the roadside of a national highway near Seoul in January and May 2008. The highway has two lanes each way, with an average hourly traffic volume of 1,070 vehicles. In January 2008, PM<
 sub>
 10<
 /sub>
  concentrations decreased from 10 to 80 m but increased at 200 m. Black carbon (BC) decreased only slightly with distance due to the influence of biomass burning and open burning from the surrounding areas. In May 2008, the effect of secondary formation on both PM<
 sub>
 10<
 /sub>
  and PM<
 sub>
 2.5<
 /sub>
  was significant due to high temperatures compared with January. Because on-road emissions had little effect on secondary formation for a short time, variations in PM<
 sub>
 10<
 /sub>
  concentrations became smaller, and PM<
 sub>
 2.5<
 /sub>
  concentrations increased with distance. The effects of fugitive dust on PM concentrations were greater in May than in January when the mean temperature was below freezing. In the composition variations, the amounts of primary ions, organic carbon (OC), and BC were larger in January, while those of secondary ions and others were larger in PM<
 sub>
 10<
 /sub>
 , as well as PM<
 sub>
 2.5<
 /sub>
  in May.