Colorado Unknown Air Quality Alert | Effective 07/13/2026 08:10
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 Sunday July 12 to 400 PM Monday July 13
IMPACTS...Ozone Action Day Alert is now in effect for the Front
Range Urban Corridor. Hot and sunny weather will allow ozone to
reach the Unhealthy for Sensitive Groups category on Sunday and