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Airshed charts and summary table can be found here and maps can be found here.
Saturday disturbance tracks into southern Canada with strong southwest flow aloft over MT and north ID. GOOD to EXCELLENT dispersion over MT. Western parts of ID may have stronger inversions as surface high pressure reaches the area for POOR to FAIR dispersion but the rest of ID should see FAIR to GOOD dispersion with stronger winds.
Sunday a weak upper level low pressure system increases clouds and shower chances across northwest MT and northern ID. This brings POOR to FAIR dispersion. Less wind and cooler temperatures will bring FAIR to GOOD dispersion to the most of central and southwest MT. Light winds and stronger inversion over eastern MT with POOR dispersion. Most of central and southern ID unstable with less clouds for better surface heating and FAIR to VERY GOOD dispersion.Dan Borsum - NRCC Meteorologist