Measurement data on disperse aerosol composition acquired in the vicinity of Tomsk in 1993 and 1994 are used to analyze aerosol variations during the passage of atmospheric fronts. It is shown that in the frontal zone, the aerosol concentration goes through a series of maxima and minima rather than peaking only once. The shape of the curve of aerosol variation within the frontal zone depends on the direction of front propagation (cold or warm) and its origin (arctic, polar, or tropical).