We are already working with CMHC on the radon issue.
Here is what is being done to remedy the problem. Canada Post has a program called smartmoves, or déménageur in French. Every time someone submits a change of address request, they receive an information kit on everything they need to think about when they move into a new home. Information on radon is part of that kit. That's a way to inform homeowners when they should test radon levels before they move into a new home.
You asked a question about moving, but I forgot what the second part of your question was about.