Overview

• Over 200 active wildfires across Manitoba, Saskatchewan and Alberta have burned more than 2 million hectares to date.
• Smoke from the blazes has covered roughly one-third of the U.S., prompting air quality alerts in states from the Dakotas through New England.
• Air quality readings climbed into “unhealthy” and “very unhealthy” categories in parts of Minnesota, Massachusetts and New York.
• The National Weather Service says much of the haze remains aloft, but dense lower-level smoke continues to degrade conditions in the Northeast and Midwest.
• Health officials advise vulnerable residents to limit outdoor activity until air quality improves, with alerts expected to remain in effect through Thursday.