As haze lingers, Edmonton and Calgary break records for summer smoke

Long summer days choked with wildfire haze has made this the smokiest summer on record in Alberta's biggest cities. 

Environment Canada data shows Edmonton and Calgary have set new records for "smoke hours," which are counted when the haze becomes particularly thick, reducing visibility along the horizon to 9.7 kilometres or less.

Records on smoke hours have been kept for more than 70 years. The previous record for both Edmonton and Calgary was set in 2018.

Between May and September of that year, Edmonton recorded 229 smoke hours. Calgary recorded 450 smoke hours during the same time frame.

This year, as of Sunday, Edmonton has recorded 244 smoke hours. Calgary has recorded 464 smoke hours so far this summer.

The totals for both cities are expected to rise as smoke continues to drift in from wildfires burning in B.C. and the north.

Heather Pimiskern, a meteorologist with Environment Canada, said a shift in the winds will mean the same plumes of smoke that drifted across Alberta over the weekend will again pass over in the province in the coming days. 

"Winds are expected to switch again overnight tonight, into tomorrow, to be from the southeast," Pimiskern said in an interview Monday. 

"All the smoke that passed over us over the last 24 hours is expected to come back into us. So unfortunately, the air quality will continue to be poor over the next couple of days." 

After days shrouded in smog, special air quality statements remain in effect for almost every part of the province. The advisories from Environment Canada caution that smoke pollution can be harmful to everyone's health, even at low concentrations.

The province spent the weekend under a blanket of smoke with air pollution measured at a 10-plus on the Air Quality Health Index (AQHI).

Developed by Health Canada, the system monitors the severity of air pollution by tracking fine particulate matter, ground-level ozone, and nitrogen dioxide. When the rating is high, people exposed to the smog face significant health risks.

The smoke moved into Alberta on Friday and despite initial forecasts that indicated the skies would clear by Saturday, the hazy conditions persisted, forcing many to cancel their long weekend plans and hunker down inside.

Some of the worst of the pollution is reaching Alberta's largest cities. Residents of Edmonton and Calgary woke up Monday to the pungent smell of fire and a haze that clouded visibility on local roads.