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Dust is one of the most important types of air pollution which find a way to the air via human and natural activities. In recent years, Boushehr province in SE Iran has been exposed to increase of dust, and the problem has worsened dramatically In the present descriptive-analytical research, it has been tried, using library and information studies, to determine the amount as well as the effects of dust upon turbidity of water of Raeis-Ali_Delwari dam in Boushehr province during 1395 AH. Sampling of water level was done at 8 points of the dam during 12 days including clear days (9 days) and dusty days (3 days). The average levels of turbidity were measured in clear days at 6.11 up to 6.59 NTU, and in dusty days at 6.81 up to 7.73 NTU. Also, the density of suspended particles was approximately 688 μ gr/m3 in dusty days, and 134 μ gr/m3 as for usual days. The results showed that although the density of particles in dusty days had reached 5 times that in usual days, the turbidity of the water of the lake behind the dam was 0.1 times higher. One could infer that 3 days after a remarkable decrease of the dust in the province, there had been no considerable effect on turbidity of the dam water. Besides, it was implied that the decline in dust had occurred due to air mass movement and not because of the particles sediment.