Atmospheric pollution meas., 3 letters
Color-coded EPA meas., 3 letters
E.P.A. pollution meas., 3 letters
Environmental datum of concern to asthmatics, for short, 3 letters
EPA concern, 3 letters
EPA pollution measure, 3 letters
EPA readout, 3 letters
EPA stat, 3 letters
Pollution meas., 3 letters
Pollution no., 3 letters
Pollution stat, 3 letters
Smog no., 3 letters
Smog stat., 3 letters