I think there are certain limitations with respect to how I can answer that question.
There is one thing I would like to point out to members in terms of our discussion today. We've had a lot of talk about ambient air. I would like to remind the committee, as it does its work, that we have one set of lungs; we breathe air, indoors and out; and we spend 90% of our time in a built environment. That is not to diminish the importance of ambient or outdoor air. We've done the studies that show the number of premature deaths attributable to smog and other bad air quality, and that on a bad air day hospital admissions go up.
At the same time, as we consider the importance of ambient air, we should be cognizant that it's one set of lungs. That bag you talked about opening up, that's in a built environment. We need to be very careful about the built environments and the pollutants and substances that we find in that area as well. They also have health implications, as we're seeing. We need to be careful about that as we move forward.