If I may, I have just two quick responses. Thanks for the question
First of all, we tabled a report in February that was giving examples of the federal government's approach to controlling air emissions generally. They were certainly not comprehensive. There were selected approaches from different menus of options.
Then the second one: we looked in this report only at the air quality health index. We didn't look at general trends and others. There are other indices, as Mr. Morse noted, and it isn't necessarily that one would replace the other, but it's not something we looked at. We looked specifically at the air quality health index for this report.