DENVER — Wildfire smoke from the Pacific Northwest drifted into Colorado with a cold front on Thursday evening, and could linger into the weekend.

According to IQAir, the smoke made Denver’s air quality the worst of any major U.S. city and among the worst in the world on Friday. Denver’s air quality index was still in the moderate range, between 50 and 100.

“It's really important to realize that just because we don't have a tragic fire here in Colorado doesn't mean our air quality is not going to be affected,” Beuther said. “Just really depending upon the size and the location and the wind patterns.”

Beuther said once an AQI reaches 100 or more, sensitive groups, such as those with asthma, chronic obstructive pulmonary disease (COPD), the very old or the very young, should limit their t

See Full Page