* WHAT…An extended period of stagnant air, with light winds and
little vertical mixing. This is due to an inversion near the
surface that could trap pollutants in valleys.
* WHERE…Portions of south central, southwest, and west central
Idaho and northeast and southeast Oregon.
* WHEN…From 9 PM MST /8 PM PST/ this evening to 9 PM MST /8 PM
PST/ Thursday.
* IMPACTS…Poor air quality may cause issues for people with
respiratory problems.
* ADDITIONAL DETAILS…The advisory continues through the long-term
forecast, and may be extended if conditions continue.