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Winter Air Quality Update & Forecast
Friday, February 27, 2015 10:41 AM

Locations and Air Quality Conditions


Current Situation Forecast
There are inversions lingering in many valleys this morning due to cold overnight temperatures. Air quality, however, has remained GOOD in most locations, while the 24 hour average concentration in Libby is MODERATE. The inversions should begin to lift later this morning in areas with ample sunshine while cloudy locations may take a little longer. Winds should be increasing this evening in most locations as a system dives southward. Most of the precipitation with this system is expected to stay to our south and west, but the increased dynamics should help create good dispersion and air quality this evening through Saturday. Bitter cold temperatures on Sunday morning may cause air quality impacts to return briefly before another system moves in on Monday afternoon. This time widespread precipitation is expected in Montana, lasting through Tuesday. Air quality impacts may return on Wednesday when a ridge builds in to the region once again.

This site will be updated only during significant air quality events for the remainder of the winter. Once wildfire season picks up, smoke updates can be found here

Kristen Martin
State Air Quality Meteorologist
Air Resource Management Bureau
Montana Department of Environmental Quality
Phone: (406) 444-0283
Email: kmartin@mt.gov




An inversion can be seen over the Helena Valley this morning due to the cold overnight temperatures. Conditions should improve this afternoon.  

An inversion can be seen over the Helena Valley this morning due to the cold overnight temperatures. Conditions should improve this afternoon.
Source: USFS

 
Scattered clouds can be seen over most of Montana this morning.

Scattered clouds can be seen over most of Montana this morning.
Source: NWS

Ventilation is expected to be good to moderate across most of western Montana this afternoon.

Ventilation is expected to be good to moderate across most of western Montana this afternoon.

Source: University of Washington 

Unsettled weather continues to impact our area today.

Unsettled weather continues to impact our area today.
Source: NOAA

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

Today's particulate report below compares particulate levels received from DEQ's
reporting stations with MDEQ’s wildfire health advisory levels.

Locations and severity of PM 2.5 particulate values since midnight of the date above.
Health Effects Categories City
  Hazardous  
  Very Unhealthy  
  Unhealthy  
  Unhealthy for Sensitive Groups  
  Moderate

 Libby 

  Good

 All other reporting sites. 

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