Descripción
https://laws-lois.justice.gc.ca/eng/acts/e-4.5/page-1.html
3 For the purposes of this Act, a national emergency is an urgent and critical situation of a temporary nature that
(a) seriously endangers the lives, health or safety of Canadians and is of such proportions or nature as to exceed the capacity or authority of a province to deal with it, or
(b) seriously threatens the ability of the Government of Canada to preserve the sovereignty, security and territorial integrity of Canada
and that cannot be effectively dealt with under any other law of Canada.