1. NPI-NILU tasks •Further development of fast simulation tool for UV radiation (Fastrt) •Applications of fast simulation tool for quality assurance of UV spectra

2. Overview •Fast simulation tool for UV doses and spectra •Solar zenith angle •Ozone columns •Clouds •Aerosols •Surfaces

3. Availability •Official web page: http://zardoz.nilu.no/~olaeng/fastrt/fastrt.html •Program documentation •Download source code

4. Benefits •Fast and easy-to-use simulation tool of UV doses and spectra •Quality assurance •UV maps •Sensitivity studies •Pseudo-inversions

5. Status •Most code in place •Some final testing remains •Minor revisions to the code to meet speed requirements •Documentation must be updated