Today's Air Site

 

Air quality information is provided on TodaysAir.mt.gov. This site displays particulate concentrations and health effects for particulate matter less than 2.5 microns in diameter. This information is measured by monitoring equipment located throughout the state. The NowCast air quality concentrations are measured against health effect categories to provide a snapshot of the severity of impacts in your location. Concentrations are updated at 15 minutes past the hour at all stations. The most recent data displayed is the average particulate concentration measured over the previous hour.

For those counties with air quality programs using averaging times beyond the 1-hour average concentration of PM2.5 in issuing air quality alerts, an alternate data tool is under development which will address these data needs and is scheduled for release around the mid-December timeframe.  Additional information regarding this tool will be provided in the near future.  In the meantime, 1-hour average PM2.5 ambient monitoring data from all stations is available from Today’s Air or the Montana Data Portal for calculating longer average periods. 

 

 

 

Today's Air Test Site

During the 2016 wildfire season, Montana DEQ  beta tested changes to the Today's Air site. This test site evaluated the use of the NowCast algorithm to provide more accurate and understandable information to our users. This algorithm simplified the health impact message while more effectively accounting for short and long-term smoke exposure. The algorithm was developed by EPA and is also used on the AirNow site. The comment period ended on September 15, 2016

 

Thank you to everyone that provided feedback.  We hope to launch the new and improved site on November 15, 2016.


 

Recommendations for Outdoor Activities

Wildfire season can frequently coincide with outdoor activities. The Departments of Health and Human Services and Environmental Quality have developed this guide to help you make decisions about outdoor sporting events when air quality is a concern.