The recent cold snap in Edmonton had me commuting in -37°C. I've never had to rely on face coverings while cycling.
Last August however I attempted to cycle from Edmonton to Vancouver but was shut down due to wildfire smoke. My next chance to attempt is again in August, and I don't expect the smoke conditions to be any better. I could go for a cycling or sports specific PAP.
If you can find time a few weeks later September is much better. Less smoke and fewer tourists-especially the rental motorhomes. Weather is a crapshoot year round but August and September pretty similar (unless it snows in either month!) Note: I'm sure you know this, it's more for any potential bike visitors.
It was cold in Calgary too, but you definitely had it worse!
I used the 3m filter mask biking in the wildfire smoke a while ago. There is a blowout hole, which makes it much easier to get stale air out. The sport-specifc one from MEC made it hard to get fresh air when biking up hill.
I used the air warmer mask during this last cold snap. It made it so much more comfortable! Last year I was fine biking in the cold snap, except for one time biking up a hill. Actually breathing hard, I got a lot more cold air in my lungs, and ended up with a cough for a week. Wanted to avoid that this year.
Last August however I attempted to cycle from Edmonton to Vancouver but was shut down due to wildfire smoke. My next chance to attempt is again in August, and I don't expect the smoke conditions to be any better. I could go for a cycling or sports specific PAP.