Abstract

Deposition rates determine the extent and intensity of the effects of atmospheric pollution. Previous measurements of the rate of dry deposition of small particles have suggested that there may be a systematic difference between wind tunnel and field results. Three recent field experiments on the dry deposition of lead, Aitken nuclei and 1.8 µm monodisperse particles are discussed. They give deposition velocities within a factor of three of the wind tunnel data. The larger deposition velocities suggested in some other experiments are not consistent with estimates of the atmospheric lifetime of small particles.

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