Air Stagnation Advisory issued December 9 at 3:14AM MST until December 12 at 2:00PM MST by NWS Boise ID

* WHAT…For the Air Stagnation Advisory, an extended period of
stagnant air, with light winds and little vertical mixing. This is
due to an inversion near the surface that will continue to trap
pollutants. For the Dense Fog Advisory, visibility less than one
quarter mile in dense fog.

* WHERE…Portions of southwest Idaho and southeast Oregon. This
includes Interstate 84 from Boise to Ontario and Highway 95 from
Weiser to Council.

* WHEN…For the Air Stagnation Advisory, until 2 PM MST Thursday.
For the Dense Fog Advisory, until 11 AM MST this morning.

* IMPACTS…Poor air quality may cause issues for people with
respiratory problems. Low visibility could make driving conditions
hazardous.