Just about every county in Idaho is under an Air Stagnation Advisory through most of the weekend. Montana has a couple counties as well that qualify for a Stagnation Advisory.

An Air Stagnation Advisory is basically an alert to warn of stale, dirty air. Very little wind in occurring to bring in fresh air, especially in valleys.

Winter months can make this problematic because of heavy use of wood stoves and more particulates hanging in the air close to the ground.

Be extra careful if you have breathing problems of any kind. Poor quality air can be problematic for those at risk.

Take a look at the map below for specific counties that are under some sort of Air Advisory for the next several days.

According to the National Weather Service:

  • AIR STAGNATION ADVISORY REMAINS IN EFFECT FROM 8 PM THIS EVENING TO 1 PM SUNDAY.
  • WHAT IS INVOLVED WITH THIS ADVISORY...An extended period of stagnant air, with light winds and little vertical mixing, is expected.
  • WHERE IS THIS ADVISORY...All of eastern and southeast Idaho.
  • WHEN WILL THIS ADVISORY TAKE EFFECT...From 8 PM Wednesday to 1 PM MST Sunday.
  • IMPACTS OF THIS AIR STAGNATION ADVISORY...Periods of air stagnation can lead to the buildup of pollutants near the surface.
  • PRECAUTIONARY/PREPAREDNESS ACTIONS... If possible, reduce or eliminate activities that contribute to air pollution, such as outdoor burning, and the use of residential wood burning devices.
  • Reduce vehicle trips and vehicle idling as much as possible. Check with local agencies for possible restrictions in your area especially if you suffer from any respiratory disorders.