Montana Department of Environmental Quality About Us Permitting & Operator Assistance Public Participation

     Winter Air Quality Updates Home | Archived Winter Air Quality Updates | Today's Air

Winter Air Quality Update & Forecast
Tuesday, March 17, 2020 10:30 AM

Locations and Air Quality Conditions

Current Situation Forecast
Clear skies overnight allowed for inversions to develop, and this morning, many locations are reporting MODERATE air quality. Additionally, some locations reporting GOOD air quality are very close to the MODERATE level, and may worsen throughout the morning. Air quality is likely to improve slightly this afternoon. Temperatures this afternoon are expected to climb above freezing, into the mid-to upper-30s, which will allow for more vertical mixing. Along with the afternoon warm-up, a disturbance will push into northwestern Montana, bringing an increase in winds and a decrease in atmospheric stability. Air quality should improve with the passage of this disturbance, and inversions will be less likely to develop overnight. Some locations will see mixed precipitation overnight- mainly snow in the higher elevations. Increased cloud cover tonight will curb extreme temperature drops, making inversions less likely to develop.

Air Quality Bureau
Montana Department of Environmental Quality
Phone: (406) 444-3490

Ventilation will improve slightly this afternoon. 

Ventilation will improve slightly this afternoon.
Source: University of Washington

Wind forecast for this afternoon.

Wind forecast for this afternoon.
Source: National Weather Service


Real time particulate information is currently available in most of the larger urban areas from MTDEQ's Today's Air website.

Today's particulate report below compares particulate levels received from DEQ's
reporting stations with MTDEQ’s Health Effects Categories.

Locations and severity of PM 2.5 particulate values over the past 24 hours from the time above.
Health Effects Categories City
  Very Unhealthy  
  Unhealthy for Sensitive Groups  

 Libby, Seeley Lake, Hamilton, Havre, Billings. 


 All other reporting locations. 

B1(x) One-hour BAM value (number of values)
B8(x) Eight-hour average BAM
B24 24 hour  average BAM value