Wildfires choke Alberta skies as air quality deteriorates

Firefighters return to retrieve more gear while tackling the Deep Creek Wildfire Complex near Entwistle, Albermore

Leslie Kramer walk her dogs as some 90 wildfires are active in Alberta, with 23 out of control, according to tmore

Smoke is seen as some 90 wildfires are active in Alberta, with 23 out of control, according to the provincial more

A firefighter conducts a controlled ignition on the Sturgeon Lake Wildfire Complex GCX001 near Valleyview, Albmore

Firefighters retreat as flames approach, amid the Grizzly Wildfire Complex, in East Prairie Metis Settlement, more

Firefighters gather for a morning briefing at Rainbow Lake Fire Hall before heading out to tackle the Long Lakmore

Smoke rises above the southeast perimeter of the Paskwa fire (HWF030) as it burns near Fox Lake, Alberta, Canamore

Smoke rises from the Bald Mountain Fire GWF 019 in the Grande Prairie Forest Area near Grande Prairie, Albertamore

A man wears a mask in Calgary, Alberta, Canada, May 16.  REUTERS/Leah Hennel

The east side of the Paskwa fire (HWF030) burns near Fox Lake, Alberta, Canada, May 9. Alberta Wildfire via REmore

Smoke is seen in downtown Calgary, Alberta, Canada, May 16.  REUTERS/Leah Hennel

A.J. Beler walks in downtown Calgary, Alberta, Canada, May 16.  REUTERS/Leah Hennel

Smoke rises from the Paskwa Wildfire (HLW030) as it burns near the Wood Buffalo National Park boundary outsidemore

Smoke is seen in Calgary, Alberta, Canada, May 16.  REUTERS/Leah Hennel

Canadian Forces members from 41 Canadian Brigade Group (CBG) participate in wildfire prevention in Drayton Valmore

Smoke rises from areas on the southeast side of wildfire EWF-035, part of the Deep Creek Wildfire Complex whicmore

Smoke rises from the WWF023 wildfire near Fox Creek, Alberta, Canada, May 13. Alberta Wildfire via REUTERS

A Sky crane helicopter dumps water on the Eagle Wildfire Complex near Fox Creek, Alberta, Canada May 19. Albermore