OZONE ACTION DAY ALERT FROM 400 PM WEDNESDAY UNTIL 1200 AM THURSDAY... 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 July 22 to 1200 AM Thursday July 23 IMPACTS...Ozone Action Day Alert is now in effect for the Front Range Urban Corridor. Ozone levels are expected to reach the Unhealthy for Sensitive Groups category in the Denver Metro area on Wednesday. Increased chances of afternoon thunderstorms are expected to keep ozone in the Good to Moderate range on Thursday. For Colorado air quality conditions, forecasts, and advisories, visit: https://www.colorado.gov/airquality/colorado_summary.aspx If possible, please help us reduce ozone pollution by limiting driving gas and diesel-powered vehicles until midnight, Wednesday night, July 22, 2026. Colorado is also addressing ozone pollution through state policies. For more information about health impacts and how ozone pollution forms in Colorado, visit: https://cdphe.colorado.gov/ozone- pollution-and-your-health HEALTH INFORMATION...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 disease, such as asthma, should reduce prolonged or heavy outdoor exertion.