There are currently two impact zones in Missoula County: M and SL. Outdoor burning is occasionally limited or restricted in these areas in order to protect public health during stagnant air conditions. Impact Zone M also comes into play during Air Pollution Warnings.
Impact Zone M
Description: Impact Zone M surrounds the greater Missoula metro area, including Frenchtown, Clinton, Lolo and Florence.
During a Stage II Air Pollution Warning, woodstove and fireplace restrictions go into the effect for Impact Zone M.
Impact Zone SL
Description: Impact Zone SL surrounds Seeley Lake, but does not include Placid Lake, Lake Alva or Lake Inez.