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Source Apportionment of Air Particulate Matter (PM2.5)in Tehran Using CMB Model

Roufigar Haghighat, Navid | 2016

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  1. Type of Document: M.Sc. Thesis
  2. Language: Farsi
  3. Document No: 48286 (09)
  4. University: Sharif University of Technology
  5. Department: Civil Engineering
  6. Advisor(s): Erhami, Mohammad
  7. Abstract:
  8. In recent years, one of the most important air pollution in Tehran in terms of creating unhealthy air quality is particulate matter and especially PM2.5. Particulate matter in Tehran is released from various sources. Identification of components and estimating the contribution of each emission sources, helps governers to find air pollution control strategies. To find out major components of PM2.5 in Tehran, a one year sampling to collect PM2.5 was conducted from February 2014 through February 2015 in AQM station at Sharif University of Technology located west of Tehran. 24-hour integrated samples collected on a 1-in-6 day schedule on both Teflon and quartz filters. TOT analysis was done for determining EC and OC concentrations and organic matters were extracted using GCMS method. Water soluble ions concentration determined by IC analysis and for finding concentration of metals SF-ICPMS method was applied. According to this analysis, average PM2.5 concentration in Tehran air was 37.13 g/m3. This value exceeds the Iranians guidelines issued by WHO in 87.5% of sampling days. Carbonaceous particles which are among the most important ingridients of particulate matters, form 38% of total PM2.5 mass. These compounds defined as OC and EC, accounting on average of 7.6 and 3.6 µg/m³, respectively. For determining SOC, three methods of EC-tracer, estimate using WSOC concentration, and CMB model was used. Results show that 16-37% of OC in Tehran air has secondary origins. Source apportionment of particulate matter in Tehran air was done using CMB model. Based on the results, gasoline and diesel vehicles contribute about 76.64% of OC and 23.23% of PM2.5 in Tehran air. Dust is about 21.25% of PM2.5 by mass and secondary ions contribute about 18.51% in PM2.5. After that vegetative detritus and biomass burning each contribute 2.98 and 1.51% of PM2.5 in Tehran
  9. Keywords:
  10. Sources Apportionment ; Particulate Flow ; Air Particulate Matter ; Organic Compounds ; Pollutants Dispersion ; Emission Sources ; Tehran ; Chemical Mass Balance (CMB) ; Secondary Carbon

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