The ornamental design for ultrasonic aromatherapy humidifier, as shown and described.
FIG. 1 is a front elevational view of ultrasonic aromatherapy humidifier showing my new design;
FIG. 2 is a rear elevational view thereof;
FIG. 3 is a left side elevational view thereof;
FIG. 4 is a right side elevational view thereof;
FIG. 5 is a top plan view thereof;
FIG. 6 is a bottom plan view thereof; and,
FIG. 7 is a perspective view thereof.
The broken lines in the drawings are for the purpose of illustrating portions of the ultrasonic aromatherapy humidifier that form no part of the claimed design.