Air treatment device

The design is the shape and configuration of the AIR TREATMENT DEVICE as shown in the drawings. The broken lines shown in the drawings are shown for illustrative purposes only and form no part of the design. In addition, the surface shading illustrated in the drawings is provided merely to highlight the contour of the design; it is not intended to be illustrative of texture or gloss.Drawings of the design are enclosed, in which:Fig. 1 is a front, top, and right perspective view of an air treatment device in accordance with the present design;Fig. 2 is a front elevational view of the air treatment device of figure 1;Fig. 3 is a rear elevational view of the air treatment device of figure 1;Fig. 4 is a right side elevational view of the air treatment device of figure 1;Fig. 5 is a left side elevational view of the air treatment device of figure 1;Fig. 6 is a top plan view of the air treatment device of figure 1;Fig. 7 is a bottom plan view of the air treatment device of figure 1;Fig. 8 is a front, top, and right perspective view of a first variant of an air treatment device;Fig. 9 is a front elevational view of the air treatment device of figure 8;Fig. 10 is a rear elevational view of the air treatment device of figure 8;Fig. 11 is a right side elevational view of the air treatment device of figure 8;Fig. 12 is a left side elevational view of the air treatment device of figure 8;Fig. 13 is a top plan view of the air treatment device of figure 8; andFig. 14 is a bottom plan view of the air treatment device of figure 8.