Right.   Canada:

i) asbestos and failure to do anything about it.   How many skyscrapers still have tons of the stuff in them?   I have personally seen contractors poking asbestos out of a ceiling of a large building in Canada.   When I enquired about it to the property manager, I was brushed off/shut down.   Very comforting, that.

ii)  Radon gas.   It's a problem in Canada with about 10 - 15% of homes affected by levels of radon that are well in excess of Health Canada's standards.   (Which, by the way, are less stringent than those in the US and those set out by the WHO.)

Asbestos and radon gas both cause lung disease/cancer.