Abstract
With recent media reports on the ozone losses or 'hole' over Antarctica, the public, particularly in Australia has become more aware of the relationship between stratospheric ozone losses and increases in terrestrial UV irradiances. Measurements over a 4 day period during April 1999 in Toowoomba (27.5 deg S, 151 .9 deg E, altitude 693m) indicated that the clear sky erythemal UV exposures could increase by 14% with a 4.6% decrease in atmospheric ozone levels. Similar anti-correlation trends between atmospheric ozone levels and UV exposures were also found for this location for other measurement times during 1999. Heightened ambient UV irradiance levels of the magnitude found during the April, 1999 period have been estimated to increase the UV exposure to the human nose from 7.15 MED per day to 8.34 MED per day.