Efforts are directed towards measurements and modeling efforts to predict UV penetration through the atmosphere to the Earth's surface and into aquatic systems. The NSF supported and operated polar UV monitoring network that is located at several permanent stations in Arctic, Antarctic and sub- Antarctic regions provides high resolution surface data which facilitates research in several disciplines. Data from the last few years is readily available in CD-format. However, CFC residence times are ten years or more, and therefore, this program must continue for at least a decade to reduce the uncertainty and map the future reductions and recoveries. The study of UV radiation and its effects in polar regions has been concentrated within NSF, with increasing interest in other agencies.
International cooperation includes joint efforts in both ozone depletion and UV radiation research.
This research also continues to support policy decisions aimed at the control of the use of halocarbons. Recent public debate has emphasized the rapid phase-cut of CFC's and some have questioned the scope of the problem. This program is needed to assess these issues and to monitor the impact of the Montreal Protocol.