With wildfire season starting earlier this year, it’s a smart time to get your home ready for what could be a long, smoky summer. Clearing brush and sealing windows can help, but improving your indoor air quality is just as important—and one of the simplest ways to do that is with an air purifier.

Canadian wildfire smoke is triggering air quality alerts across the U.S. Midwest and Northeast on Thursday, as the northern nation’s boreal forests continue to burn at a rate not seen except for a historic season in 2023.

Smoke has made its way back into the northern tier of the U.S., prompting air quality alerts in North Dakota, Minnesota and Montana on Wednesday and Thursday.