An air quality advisory is expected to remain in effect until noon June 6 as Michigan continues to see effects of Canadian wildfire smoke.

Canada is facing widespread wildfires. Manitoba and Saskatchewan have declared emergencies. Many residents have been evacuated. Air quality alerts are in effect in the US and Europe. Several parks are closed in Manitoba and Saskatchewan.

Many fires burning across Canada, forcing evacuations and threatening air quality in the United States, cannot simply be put out, authorities and experts say.

Wildfire smoke was helping raise ozone to hazardous levels. No alerts have been issued, but the air quality may approach “code orange” levels again late Thursday afternoon in parts of the region, as it appears that the ozone factory will still be operating while the Canadian wildfire smoke persists in the skies over Philly.

Hedge funds boosted their bullish stance on US crude by the most in five months as wildfires endangered Canadian flows and OPEC+ increased production less than some had feared.

More than 200 wildfires are raging across Canada, sending a thick blanket of choking smoke through the U.S. Midwest. Experts says climate change means U.S. residents better get used to it.

Wildfires burning in Canada's oil-producing province of Alberta have reduced the country's daily crude production by about 7%. Here is a tally of affected oil production sites so far:

Wildfires have forced another 1,000 people to flee their homes in the Canadian province of Manitoba, which is under a state of emergency.