The relative contributions of gravity and turbulent diffusion mechanisms to the process of dust deposition on smooth glass surface under ambient conditions have been studied. For this goal dust was collected on the glass samples having different slopes and keeping parallel to wind direction.Our outdoor measurements indicate that, for particle sizes larger than 2 μm under conditions known as dry deposition , the process of dust accumulation is dominated by sedimentation under gravity. This fact enables measured surface data to be used in conjunction with an appropriate model, in order to deduce the corresponding volume concentrations for various ranges or airborne dust-particle sizes. It gives also a possibility to measure the deposition velocity of particles under controlled conditions relative to their terminal velocity. The last is important for investigation into the possibility of surface protection against dust. This methodology is illustrated by data taken in the Northern Negev desert.