Active Weather Alerts
Air Quality Alert
Issued: 10:11 PM Jul. 18, 2026 – National Weather Service
...OZONE ACTION DAY ALERT FROM 400 PM SATURDAY UNTIL 400 PM SUNDAY... 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 Saturday July 18 to 400 PM Sunday July 19 IMPACTS...Ozone Action Day Alert is now in effect for the Front Range Urban Corridor. Hot and sunny weather will allow ozone to reach levels that are Unhealthy for Sensitive Groups on Saturday and Sunday. The highest concentrations are most likely in western portions of the northern Colorado Front Range region. 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 at least 4 p.m. Sunday, July 19, 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 in sensitive individuals, aggravation of heart or lung disease and premature mortality in people with cardiopulmonary disease and older adults. People with heart or lung disease, older adults, and children should reduce prolonged or heavy exertion.
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