UV Advisory Environment Canada is forecasting a 6% decrease in average ozone from May to August over Southern Canada in 2000. This is predicted to result in an average ultraviolet radiation (UV) increase to be about 7% over all of Southern Canada this spring and summer. Over Northern Canada, UV is expected to increase by a similar amount. Usually UV intensity is highest in June and July, reaching UV index levels of between 7 and 8 (burn time about 20 min) in Southern British Columbia levels of 4 (burn time about 30 min) or higher begin in early April and last until mid September. In Northern British Columbia and Yukon, UV Index levels are generally lower than in southern British Columbia. With a 7% UV increase, Southern Canada can expect an increase of about 0.3 to 0.5 in UV index levels. This would increase the number of days that sunburn could occur in about 20 min or less. In Northern British Columbia and Yukon the UV index is expected to rise by a similar amount this summer.