ABSTRACT
The UV and global solar radiation on a horizontal surface at ground level in Riyadh City (latitude 24° 34' N, longitude 46° 43' E) have been measured and analyzed. Measurements of UV radiation (295-385 nm) were recorded every 10 min for five years (January 1983-December 1987). The maximum recorded hourly mean irradiance UV radiation was 28 W/m2 and occurred in July, while the minimum was 14 W/m2 in December.