Montana
Take Action
High Ozone Days Particle Pollution Groups At Risk  
County
Grade
Wgt.
Avg.
Orange
Days
Red
Days
Purple
Days
Cascade - - - - -
Flathead A 0.0 0 0 0
Gallatin - - - - -
Lake - - - - -
Lewis And Clark - - - - -
Lincoln - - - - -
Missoula - - - - -
Ravalli - - - - -
Rosebud - - - - -
Sanders - - - - -
Silver Bow - - - - -
Yellowstone * * * * *
Donate
American Lung Association State of the Air: 2008 NOTES

(1) * indicates incomplete monitoring data for all three years. Therefore, those counties are excluded from the grade analysis.
(2) A dash (-) indicates that there is no monitor collecting data in the county.

More about Methodology.