Moderate Expected Likely Air Stagnation Advisory Air Stagnation Advisory issued December 14 at 4:17AM MST until December 16 at 5:00AM MST by NWS Boise ID Dec 14, 4:17 AM → Dec 16, 5:00 AM WHAT: An extended period of stagnant air, with light winds andlittle vertical mixing. This is due to an inversion near thesurface that will continue to trap pollutants. WHERE: Portions of south central and southwest Idaho andnortheast and southeast Oregon. WHEN: Until 5 AM MST /4 AM PST/ Tuesday. IMPACTS: Poor air quality may cause issues for people withrespiratory problems. + Read More Persons with respiratory illness should follow their physicians advice for dealing with high levels of air pollution during periods of stagnant air. Updated: Dec 14, 4:34 AM Source: NWS Alert