Hundreds of wildfires are burning across the Western states, Alaska and Canada as fire season perks up amid a sprawling heat wave and widespread dry conditions. More than 100 of the blazes are in the United States,

The blazes have destroyed nearly 15 million acres of land, and the fire season is expected to go into September. With it comes the threat of smoky days in Minnesota and North Dakota.

Canada calls for international help to battle massive wildfires 01:23. Toronto — At least 33,400 people have been forced to evacuate their homes in three Canadian provinces due to active ...

More than 200 wildfires are blazing across central and western Canada, half of which are out of control because they’re so hard for crews to access, forcing 27,000 people to evacuate. Even those ...

Experts are urging everyone to be ready if wildfire smoke is in their region. Wearing a well-fitted N95 mask outside can be one of the ways to reduce risk.

This story was originally published by Grist.Sign up for Grist’s weekly newsletter here.. More than 200 wildfires are blazing across central and western Canada, half of which are out of control ...

More than 200 wildfires are blazing across central and western Canada, ... Scientists call them zombie fires. As Canada’s wildfire smoke creeps down into the U.S., it’s also transforming.