Active Weather Alerts
Air Quality Alert
Issued: 3:11 PM Aug. 4, 2025 – National Weather Service
...OZONE ACTION DAY ALERT FROM 400 PM SUNDAY UNTIL 400 PM MONDAY... 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 August 03 to 400 PM Monday August 04 IMPACTS...Ozone Action Day Alert is now in effect for the Front Range Urban Corridor. Ozone concentrations will stay in the Good to Moderate range on Sunday. On Monday, hot temperatures, light winds, and abundant sunshine will allow ozone to reach concentrations that are Unhealthy for Sensitive Groups. The highest concentrations are expected along the Front Range and foothills, from western Denver northward to Fort Collins. 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. Monday, August 4, 2025. 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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