At the risk of talking when I haven't prepared myself on the topic, because I focused on products, I think you're pointing out a really important issue. You're focusing on areas where the concern is the greatest, in terms of health concerns from air pollution, and in particular on concerns about the smog-forming air pollutants, the so-called “criteria air contaminants” that are primarily coming from transportation and some large industrial sources.
The inter-jurisdictional issue of concern there that needs to be addressed, where standards need to be strengthened, is Canada-wide standards.