Kelowna PM2.5 Characterization Monitoring Project

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In order to characterize PM2.5, determine and quantify its sources and assess its impact on visibility, a speciation sampling program was initiated in Kelowna in September 2006. PM2.5 concentrations measured at the Okanagan College site during this study ranged from 1.5 to 22.1 μg/m3, and average/median concentrations were 6.6/4.7 μg/m3. A PM2.5 mass reconstruction showed that on average over the course of the study, organic matter made up 48% of the mass, followed by elemental carbon and ammonium nitrate at 15%. The quantification of several organic tracer compounds provided further information on source contribution, particularly in the cold season. The visibility extinction coefficient estimated during this study ranged from 21 to 192 Mm-1 and averaged 52 Mm-1, which corresponds to an average visual range of 75 km, with values ranging from 186 km down to 20 km.
The results of this study showed that while PM2.5 levels in Kelowna remained below established 24-hour average objectives, elevated levels do occur in the winter. In the cold season, when PM2.5 is the highest, traffic and wood-burning sources were estimated to make up the majority of PM2.5. Efforts to achieve significant reductions of PM2.5 during this season, therefore, should consider reductions strategies for these two sources.

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  • Author: Environment Canada
  • Language of Document: Separate English/French
  • Document Type: Report
  • Cat. No.: En56-248/2014E-PDF
  • ISBN: 978-1-100-23716-9
  • Size: 21.6x28
  • Pages: 46
  • Year: 2012
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