Wildfires that tore through Los Angeles early this year may have caused hundreds more deaths than official reports show, new research suggests. While the fires were said to have taken 31 lives, a study published Wednesday in the Journal of the American Medical Association estimates that about 440 more deaths may be linked to the disaster.

Wildfires that tore through Los Angeles early this year may have caused hundreds more deaths than official reports show, Boston University researchers suggest.

Air quality alerts remain in effect from Minnesota to the Northeast due to smoke from hundreds of wildfires in Canada. In the West, wildfires in California continue to rage.

As Canada grapples with one of its worst wildfire seasons on record, smoke from the blazes have prompted air quality alerts across the U.S.

Smoke from fires across the West and Canada is causing potential health risks for people across the U.S. Satellite images show smoke from the wildfires in California is creating unhealthy air as far away as Las Vegas.