PPT Slide

Back Trajectories from Ontario Sites on Days with

High Arsenic/Selenium Ratios: 1988-92

Provided by Ray Hoff, Atmospheric Environment Service, Environment Canada

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During a similar time period, Ray Hoff from environment Canada, AES had also noted high Arsenic concentrations at several southern Ontario sites. Ray used the ratio of Arsenic (emitted by both Coal combustion and Smelters) to Selenium (emitted in much higher quantities by Coal burning) to focus on the Smelter influences. His back trajectories (calculated by the AES Trajectory model) tend to implicate Sudbury rather than Noranda for these high arsenic events. Hum?