A linear correlation between UV-A and 380 nm was developed by means of the TUV 4.1 radiative transfer model. The prediction error of the correlation was evaluated with data from Buenos Aires, Argentina, 2001, and from 2006, Almeria, Spain. Percent random mean square error (RMSE%) was calculated for intervals of 10 degrees of solar zenith angles, ranging 4.75% at 20 degrees to 37.70% at 90 degrees in clear days and 22.16% at 20 degrees to 26.17% at 90 degrees for cloudy days in Buenos Aires Argentina, and 1.27% at 20 degrees to 11.27% at 90 degrees for clear days in Almeria, Spain. Clouded days were not assessed with the data from Spain. In Argentina, the UV-A radiometer is located in a rural area and the 380 nm radiometer is located in an urban area. 6 km away. Hence the real error of the proposed model is closer to that found in Spain were both measurements were performed at the same site. The objective of the work is to achieve a simple and precise method to assess UV-A availability for environmental applications of solar energy, particularly for solar water treatment, at any desired latitude. (C) 2008 Elsevier Ltd. All rights reserved.