Environment Canada says these smoky conditions could remain until Wednesday.
The smoke from massive wildfires hangs like fog over large parts of the U.S. West, an irritating haze causing health concerns, forcing sports teams to change schedules and disrupting life from Seattle to tiny Seeley Lake, Montana.
Biologist Jackie Hilderling says four years of decline in B.C.'s sea star population is due to climate change warming local waters and making the animals susceptible to sea star-associated densovirus.
Hundreds of Pacific walruses came ashore to a barrier island on Alaska's northwest coast, the earliest appearance of the animals in a phenomenon tied to climate warming and diminished Arctic Ocean sea ice.
Heavy rain and winter runoff in the month of May has affected more than people's homes along the Ottawa River. The river itself, often polluted with sewage overflow after a day or two of heavy rain, has had to absorb more than 600-million litres over the past week alone.
Lutselk'e, N.W.T. is one of several communities in the Northwest Territories that has been blanketed by smoke over the past few days thanks to strong south winds blowing smoke up north from fires burning south of Great Slave Lake.
Officials worry about the possible transmission of pathogens between domestic sheep and goats and wild thinhorns, an issue which has caused some tension among local farmers.
Smoke from a wildfire in southwestern Greenland is hampering the wild reindeer hunt on the Arctic island.
Smoke from a wildfire in southwestern Greenland is hampering the wild reindeer hunt on the Arctic island, best known for its ice rather than burning grass and bushes.
Finding the deep-diving species so far inland was incredible. Rescuers made a sterling effort to save the 21ft-long animal found in a tributary of the River Clyde near Glasgow Airport. Two died after stranding on shores of the Firth of Clyde and another in the Western Isles.
As climate change opens new regions to mosquitoes, Nepal suffers an outbreak of the painful viral disease that has sickened more than 9,000 people.
The colourful Portuguese man-of-war is more commonly seen in warmer waters. Their painful stings can be fatal to some.
Victoria's biggest-ever reef restoration project is underway, in attempt to restore the once abundant populations of native oysters in Port Philip Bay.
Hundreds of firefighters and dozens of aircraft are working to contain the largest wildfire ever recorded in British Columbia's history, and it could take weeks to get it under control.
Scientists with the Department of Fisheries and Oceans say late spawning for capelin had a significant impact on numbers.
This research provides a scientific reference for the design, construction, operation and maintenance of engineering facilities in the permafrost region of the Qinghai-Tibet Plateau.
Black bears typically stay near the treeline — but what was this guy doing so far up North, away from it?
Nunavut's Department of Health is warning Coral Harbour residents that trichinella has been detected in a walrus that was harvested on Aug. 21.
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