Author(s)

W.F.J. Evans & R. Acosta

Abstract

The measurement of ultraviolet radiation and sunburn time over Southern Ontario and Mexico City W.F.J. Evans, R. Acosta Atmospheric Physics Lab., Department of Environmental Resource Studies, Trent University, Peterborough, Ontario, Canada, K9J 7B8 ABSTRACT Studies of the depletion of ozone which have been conducted from the TOMS instrument on the NIMBUS 7 satellite indicate that total ozone has declined by 5 % over the last 12 years at most mid-latitudes in the northern hemisphere typical of southern Ontario. The measurement of the actual resultant increases in UV-B is now important A monitoring program of UV-B (biologically active solar ultraviolet radiation) has been conducted for the last 24 months at a site near Bolton, Ontario. A measure of the effect of UV-B radiation on humans is the SUNDEX sunburn time. In a pilot project in the summer of 1990, the SUNDEX was measured in the morning and transmitted to the media for broadcasting in the afternoon. This monitori

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