Colorado Unknown Air Quality Alert | Effective 06/18/2026 13:10
The Colorado Department of Public Health and Environment has
issued the following...
WHAT...Ozone Action Day Alert.
WHERE...Douglas, Jefferson, Denver, western Arapahoe, western
Adams, Broomfield, Boulder, Larimer, and Weld Counties
WHEN...400 PM Wednesday June 17 to 400 PM Thursday June 18
IMPACTS...Ozone Action Day Alert is now in effect for the Front
Range Urban Corridor. Breezy winds will limit ozone development
on Wednesday. However, hot and stagnant weather will allow ozone