Colorado Unknown Air Quality Alert | Effective 06/19/2026 17:10
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...345 PM Friday June 19 to 400 PM Saturday June 20
IMPACTS...Ozone Action Day Alert is now in effect for the Front
Range Urban Corridor. Continued hot and stagnant weather will
allow ozone to reach the Unhealthy for Sensitive Groups category