Measurements were carried out at Cairo (30.05 degreesN, 31.17 degreesE) and Aswan (23.58 degreesN, 32.47 degreesE) in Egypt for three years (1990-1992) by the Egyptian Meteorological Authority. The measurements were done using an Eppley ultraviolet radiometer to measure the global ultraviolet solar radiation (UV), Eppley pyranometers to measure the global solar radiation (G) and the pyrgeometers with silicon dome from Eppley to measure the atmospheric infrared radiation (IR). The clearness index (K-t) and the diffuse fraction (K-d) for both regions have been calculated. Finally the total suspended particles for Cairo and Helwan and their interaction with the solar radiation has been found.