We have devised a partial differential equation for the prediction of
dust concentration in a thin layer near the ground. In this equation,
erosion (detachment), transport, deposition and source are parameteris
ed in terms of known quantities. The interaction between a wind predic
tion model in the boundary layer and this equation affects the evoluti
on of the dust concentration at the top of the surface layer. Numerica
l integrations are carried out for various values of source strength,
ambient wind and particle size. Comparison with available data shows t
hat the results appear very reasonable and that the model should be su
bjected to further development and testing.