Studies of the number concentration and size distribution of the suspended dust particles in the atmosphere of Qena/Egypt

Studies of particle number concentration, size, shape and distribution of the dust particles suspended in the atmosphere of Qena (upper Egypt) have been conducted. The results show that the concentration of these particles decreases with increasing size according to the Junge power law size distribution: n(d_p) = C/ln10 (d _p)^?(α+1. The values of the exponent α range from 1.3 to 2. The largest number of particles have sizes less than 2 μm with irregular shape. The effect of some weather conditions on the total number of particles was considered. The total number of particles and effective mean diameters were calculated.