A simple mathematical model was used to study the effect of particle size distribution on dry deposition efficiency. For this purpose, two distributions of aerosol size were used, typical of polluted environments: a distribution of burnt environment (Amazônia) and another of urban environment (São Paulo). The results showed that particles originating from the urban environment are more efficiently removed by deposition than by burning particles. This behavior is associated with the fact that the nature of particle removal by deposition is inefficient for diameters between 0.1 and 1.0 mm, in which most of the particles are concentrated.
