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Abstract
Measurements of biologically effective solar ultraviolet irradiation at Barrow, Alaska (71° 20'N, 156° 46'W), during late July and early August 1970, under clear to partly cloudy skies, indicate substantially lower intensities than would be expected at low elevations in temperate latitudes for the same solar angles. These lower intensities might be attributed to high atmospheric ozone concentrations at northerly latitudes which effectively attenuate the most biologically effective UV wavelengths.