It's a very complex issue. I can answer that this is the case in general, but not for this specific issue at the moment.
I will be very honest about this. With regard to environmental and transportation noise in a city like Montreal, it is clear that the most disadvantaged people are those who are most exposed because of their location near noise-generating factors.
However, for reasons that go back several years, this is not necessarily the case at the airport. It would be dishonest to say otherwise. No doubt noise reduces home equity, but in Montreal, the problem of aircraft noise is a somewhat special case in relation to health inequalities.