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Please use this identifier to cite or link to this item: http://hdl.handle.net/1807/10430

Title: Chemical Composition Fluctuations in the Gaseous and Particulate Phases of Urban Aerosols
Authors: Godri, Krystal
Advisor: Evans, Greg J.
Department: Chemical Engineering and Applied Chemistry
Keywords: urban aerosols
aerosol chemistry
Issue Date: 25-Jul-2008
Abstract: 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.
URI: http://hdl.handle.net/1807/10430
Appears in Collections:Master
Department of Chemical Engineering and Applied Chemistry - Master theses

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