||Acid Aerosol Transport Episodes in Toronto, Ontario.
Thurston, G. D. ;
Waldman, J. M. ;
||New York Univ. Medical Center, NY. Inst. of Environmental Medicine. ;Robert Wood Johnson Medical School, Piscataway, NJ. Dept. of Environmental and Community Medicine.;Health Effects Research Lab., Research Triangle Park, NC.
Air pollution ;
Sulfur oxides ;
Respiratory diseases ;
Eastern Region(United States) ;
Air pollution monitors
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Authors used recently developed equipment to continuously monitor levels of H2SO4, NH4HSO4 and (NH4)2SO4 concentrations in the ambient air outside Toronto, Ontario. These data were combined with 48-hour isobaric air mass back-trajectories ending in Toronto on each of the four days with highest acid (and sulfate) aerosol levels. The air masses with highest acid levels were found to have first passed over the SO2 source region of the U.S. and then across the Great Lakes to Toronto. The role of ammonia as a modulator of aerosol acidity for eastern U.S. cities but not for Toronto (where the Great Lakes serve as ammonia sinks) is also discussed.