Yes and no. Riding a bike at your best speed isn’t going to happen with a mask, but I prefer not to work up a sweat while commuting, so I’m not using enough oxy

Yes and no. Riding a bike at your best speed isn’t going to happen with a mask, but I prefer not to work up a sweat while commuting, so I’m not using enough oxygen for the mask to make a difference. That said I might feel differently in a hotter climate.