J. Phys. IV France 107 (2003) 1435
Gaseous Elemental Mercury (GEM) in downtown TorontoY. Lu Julia, M. St Denis and X. Feng
Department of Chemistry, Biology and Chemical Engineering, Ryerson University, 350 Victoria Street, Toronto, Ontario M5B 2K3, Canada
Gaseous elemental mercury (GEM) concentrations in downtown Toronto, Canada were monitored from June 2001 - February 2002 at two levels (3.5 and 7m) above the ground. The mean quarter-hourly concentrations for the time series were 2.39 ng/m 3 for the bottom line and 2.57 ng/m 3 for the top line. When divided seasonally, the highest concentrations were observed in the summer months 3.03 ng/m 3 (bottom) and 3.31 ng/m 3 (top) and the lowest values were observed in the fall with 1.84 ng/m 3 (bottom) and 1.97 ng/m 3 (top). When analysed over a 24 scale, the pattern was characterized by highest GEM concentrations during the daytime relative to nighttimes. The results will be compared with those obtained from the rural and remote sties in the Canadian Atmospheric Mercury Measurement Network (CamNet).
© EDP Sciences 2003