Ozone Action Day Alert
Effective: 6/18/2025 4:00:00 PM - 6/19/2025 4:00:00 PM
Affected Area: Douglas, Jefferson, Denver, western Arapahoe, western Adams, Broomfield, Boulder, Larimer, and Weld Counties

Public Health Recommendations: Increasing likelihood of respiratory symptoms and breathing discomfort in active children and adults and people with lung disease, such as asthma. Active children and adults, and people with lung...
Outlook: Ozone Action Day Alert is now in effect for the Front Range Urban Corridor. Ozone is expected to be in the Good to Moderate range on Wednesday. However, hot, sunny, and stagnant weather will...