First Nations from northwestern Ontario have had to evacuate to Thunder Bay as wildfires consume their homes; Doctors encourage vulnerable populations to stay inside as much as possible as Toronto ERs see an increase in breathing difficulties; and, investigators suggest that steel tracks expanding due to heat may have contributed to a frightening train derailment in Quebec.

<p>First Nations from northwestern Ontario have had to evacuate to Thunder Bay as wildfires consume their homes; Doctors encourage vulnerable populations to stay inside as much as possible as Toronto ERs see an increase in breathing difficulties; and, investigators suggest that steel tracks expanding due to heat may have contributed to a frightening train derailment in Quebec.</p>

CTV National News is Canada's most-watched national news program. Now you can stay up to date Monday to Sunday with the CTV National News Podcast, delivered nightly. Listen to Canada’s most trusted newscast featuring stories from here and around the world with a perspective that is distinctly Canadian and backed by the #1 news organization in Canada.

<p>CTV National News is Canada's most-watched national news program. Now you can stay up to date Monday to Sunday with the CTV National News Podcast, delivered nightly. Listen to Canada&rsquo;s most trusted newscast featuring stories from here and around the world with a perspective that is distinctly Canadian and backed by the #1 news organization in Canada.</p>