The heavy smoke is causing cancellations at the Canadian Rockies International Airport.
A representative with Pacific Coastal Airlines confirmed their flights in and out of Cranbrook Sunday had been cancelled due to zero visibility from the smoke.
They said all flights up until 9 pm Sunday were affected, with no word on whether any further flights would be cancelled as well.
West Jet flights are running on time.
The City of Cranbrook says the airport is still open, but individual airlines are making the call whether or not to fly in or out.
The airlines are monitoring the situation closely.
Residents are advised to check with their airline ahead of time for the status of their flight.