Portable air compressor

FIG. 1 is a top, front, right-side perspective view of a portion of a portable air compressor;

FIG. 2 is a front view thereof;

FIG. 3 is a back view thereof;

FIG. 4 is a right-side view thereof;

FIG. 5 is a left-side view thereof;

FIG. 6 is a top view thereof; and,

FIG. 7 is a bottom view thereof.

The dot-dashed broken separation lines disclaim the length of the portable air compressor. The separation lines and portion between the separation lines form no part of the claimed design.