How is UV radiation level changing at the Earths surface?
Direct measurement of UV-B radiation levels is technically complicated. However, there is overwhelming scientific evidence that Ozone depletion leads to more UV-B reaching the Earth surface and that the amount of increase can be predicted from trends in Ozone levels. On this basis, UV-B at mid latitude is calculated to have increased by 8 – 10 percent over the last 15 years (the calculation is for UV-B radiation at a wavelenghth of 310 nanometers at latitudes 45 degrees north and south over the period 1979-1994). Calculated increases in UV-B to date are large at higher latitude and for shorter waving lengths.
