Maybe one of the things I will discuss—and ask Charles if he has more to elaborate on—is that ozone in the upper atmosphere is not something that's specific to Toronto, Vancouver, or Edmonton. It is a large layer and covers lots of geography. It is the ozone that's really at ground level that's a concern for human health. It is produced by things like traffic and smog. The Arctic certainly doesn't have a concern about that kind of ozone production. So, again, from the science, you would say you don't need that kind of local monitoring of low level ozone.
We are concerned about the hole, which is high. It's a temporary hole that does not exist throughout the year. It occurred this year at the end of the winter and early spring, because of the cold conditions.
We've said, and I will continue to say, that we have committed to continue to have the monitoring sites in the far north. Indeed, the interest in the international community in them is because they are not so specific to Canada's north, but give us information on what's happening in the hemisphere.