Certainly, we're aware of Dr. Louis Drouin's work in Montreal particularly, and in helping to get citywide standards that are actually perhaps lower than the Canada-wide standards. It's particularly important for the Montreal area, which has both traffic problems and wood stove problems that are relevant to particles in the air.
I don't see any reason you couldn't use city standards as a good example, but the main thing is that for human health reactions to things like particles, there's no safe level, so even if you have a low level of exposure, some people get sick. So every effort to bring those standards down to what is achievable is always good, whether you use a Montreal standard, or a United States standard, or a Canada-wide standard. The lower the better.