Dr. McElroy is one of Canada's foremost atmospheric scientists. He is a co-inventor of the Brewer ozone spectrophotometer, now used for ozone measurements world-wide, and the UV index, which is used to inform the public of the safety of remaining outside in sunlight.

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McELROY, Charles Thomas –Environment Canada
Dr. McElroy is one of Canada's foremost atmospheric scientists. He is a co-inventor of the Brewer ozone spectrophotometer, now used for ozone measurements world-wide, and the UV index, which is used to inform the public of the safety of remaining outside in sunlight. He has developed techniques for measuring ozone and other gases from the ground, from aircraft and from space. He has developed instruments used by astronauts on the space shuttle and the MAESTRO instrument on Canada's SCISAT satellite. He has sat on numerous national and international committees, and received numerous awards.