I was thinking more of living and working in a city just outside Toronto, not commuting (that sucked a lot when I had to do it). Subway from North York isn't that bad, it was being on the end of the bus line that left from the end of the subway line that bugged me.
Yeah, walking around wearing a filter mask is inviting stares, but someday it might get all too common. :/ I kinda sorta want nose plugs that will semi-discreetly filter the air for me.