I'm trying to understand better how you do measurements, particularly around the Great Lakes and St. Lawrence basin, given the fact that's where the largest concentration of our air pollution comes from, in terms of both air and water, because it is shared and there are no borders there between Canada and the U.S. when it comes to air pollution.
How do you go about that? Do you work with the American EPA? How do you manage to get the right data so that we are comparing apples to apples and not apples to oranges?