Airshed
Management
System

Airshed charts and summary table can be found here and maps can be found here.

Sunday dispersion is similar but a bit of increased wind helps improve dispersion to all of southwest MT.

Monday upper level low pressure lifts into Canada but still POOR dispersion over north ID and northwest MT due to trapped low level cool air. More of western MT and all of southwest and central and easter MT GOOD to VERY GOOD dispersion with more wind. Central and southern ID lighter winds drive a change to FAIR to GOOD dispersion. 

Dan Borsum - NRCC Meteorologist