From June 2006 to March 2007, the concentrations of water soluble inorganic
particulates and their associated precursor gases were semi-continuously measured
adjacent to a high traffic street in downtown Toronto, Canada. Measurements underwent
extensive quality assurance and control protocols. Seasonal and diurnal variations in
HNO3 and NH3 partitioning to NH4NO3 were observed. Long range transported air
masses from southwest of Toronto were the predominant source of measured SO4
2- for all seasons. The contributing sources of PM2.5 nitrate mass fluctuated between seasons: pNO3- was predominantly locally derived in the summer and resulted from long range transport in the winter. Comparison between measurements and ISORROPIA
thermodynamic model predictions identified model weaknesses and was used to explore
the effect of modulating primary gas concentrations on consequent particulate levels. SO2 emissions reductions were the most influential and direct method to reduce overall PM2.5 concentrations; however, limiting ammonia emissions was also another successful strategy.
| Identifer | oai:union.ndltd.org:TORONTO/oai:tspace.library.utoronto.ca:1807/10430 |
| Date | 25 July 2008 |
| Creators | Godri, Krystal |
| Contributors | Evans, Greg J. |
| Source Sets | University of Toronto |
| Language | en_ca |
| Detected Language | English |
| Type | Thesis |
| Format | 6739053 bytes, application/pdf |
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