Air treatment system

FIG. 1 is a front perspective view of the air treatment system of the new design;

FIG. 2 is a right side elevational view thereof, the left side being a mirror image of the right side elevational view;

FIG. 3 is a top plan view thereof;

FIG. 4 is a bottom plan view thereof;

FIG. 5 is a front elevational view thereof; and,

FIG. 6 is a rear elevational view thereof.

FIGS. 1-6 show features of the air treatment system filter in broken lines. These features are shown for environmental purposes and do not form any part of the claimed design. Further, the broken lines immediately adjacent the solid-line portions of the design form the boundary of the design, with the broken lines forming no part of the claimed design.