* WHAT…An extended period of stagnant air, with light winds and
little vertical mixing. This is due to an inversion near the
surface that can trap pollutants.
* WHERE…Portions of south central, southwest, and west central
Idaho and northeast and southeast Oregon.
* WHEN…Until 9 AM MST /8 AM PST/ Friday.
* IMPACTS…Poor air quality may cause issues for people with
respiratory problems.