INCREASED UV EXPOSURE IN FINLAND IN 1993

Exceptionally low total ozone, up to 40% below the normal level, was m easured over Northern Europe during winter and spring in 1992 and 1993 . In 1993 the depletion persisted up to the end of May, resulting in a significant increase of biologically effective UV radiation. The incr eases were significantly smaller in 1992 and 1994 than in 1993. The UV exposure of the Finnish population was evaluated through measurements and theoretical calculations. The increase in measured erythemal (Int ernational Lighting Commission) UV falling onto horizontal surfaces on clear days was determined relative to model calculations for an avera ge ozone amount. The increase was on average 10% from April to May 199 3, and the maximal measured increase was 34%. Theoretical calculations for both erythemal and carcinogenic (Skin Cancer Utrecht-Philadelphia ) UV indicated that in 1993 the theoretical annual increase to a verti cal (cylinder) surface ranged from 8 to 13% in Finland. The reflection of UV from snow considerably increases facial UV doses in Northern Fi nland.