Active Weather Alerts
Air Quality Alert
Issued: 10:11 PM May. 11, 2026 – National Weather Service
...OZONE ACTION DAY ALERT FROM 400 PM MONDAY UNTIL 400 PM TUESDAY... 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 Monday May 11 to 400 PM Tuesday May 12 IMPACTS...Ozone Action Day Alert is now in effect for the Front Range Urban Corridor. Concentrations of ozone in the Unhealthy for Sensitive Groups category are possible on Monday and Tuesday for locations in the northern Colorado Front Range region, including the Denver Metro area, Fort Collins, Greeley, and surrounding areas. For Colorado air quality conditions, forecasts, and advisories, visit: https://www.colorado.gov/airquality/colorado_summary.aspx If possible, please help us reduce pollution by limiting driving gas and diesel-powered vehicles until at least 4 PM Tuesday, May 12, 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.
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