Smoke from several wildfires burning in northern Arizona blew northeast and blanketed Denver, Colorado, on June 13.
The largest of the blazes, the Pipeline Fire, began on Sunday north of Flagstaff. By Monday, it had grown to 5,000 acres, according to authorities. Firefighters were also battling the Haywire Fire and Double Fire, both of which broke out in Coconino National Forest.
Satellite models forecast smoke from the fires would blow northeast, spreading across Colorado and the Midwest before reaching Canada and parts of the US Northeast. This video, recorded by the Colorado Department of Public Health and Environment (CDPHE), shows visibility in Denver diminishing over the course of Monday morning as smoke moved through the area. Credit: CDPHE via Storyful