I have two comments to make there.
There are a lot of studies. There are certainly studies that show there are health impacts; there are other studies that show there are not. From our perspective, the evidence is not conclusive. There are many studies, some that are convincing, others that are not.
In terms of Health Canada, any time there's a review of noise abatement procedures that are submitted to our national committee for approval, Health Canada is consulted on those changes and procedures and they look very specifically at the exposure levels of noise to see if there's an impact on health. They are involved in individual cases when they come through for change.