Getting your player ready...
A has been extended for all of Colorado east of the Continental Divide, including Denver, through Wednesday morning because of large wildfires burning in Canada.
The thick haze led to delays at the Denver International Airport
.
The advisory was first issued late Monday night and encompasses the cities of Denver, Boulder, Fort Collins, Greeley, Colorado Springs, Pueblo, Trinidad, Lamar, Burlington and Sterling.
Health officials say if smoke becomes thick, people may want to remain indoors.
The State Patrol warned motorists the smoke could reduce visibility on roads.
