Active Weather Alerts
Air Quality Alert
Issued: 9:11 PM Sep. 5, 2025 – National Weather Service
...ACTION DAY FOR PARTICULATES FROM 400 PM THURSDAY UNTIL 400 PM FRIDAY... The Colorado Department of Public Health and Environment has issued the following... WHAT...Action Day for Particulates. WHERE...Douglas, Jefferson, Denver, western Arapahoe, western Adams, Broomfield, Boulder, Larimer, and Weld Counties WHEN...400 PM Thursday September 04 to 400 PM Friday September 05 IMPACTS...Action Day for Particulates is now in effect for the Front Range Urban Corridor. Elevated levels of fine particulate matter will remain in the Front Range on Friday due to lingering smoke. Ozone Levels are expected to remain in the Good to Moderate range. 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 Friday, September 5, 2025. HEALTH INFORMATION...If smoke is thick or becomes thick in your neighborhood you may want to remain indoors. This is especially true for those with heart disease, respiratory illnesses, the very young, and older adults. Consider limiting outdoor activity when moderate to heavy smoke is present. Consider relocating temporarily if smoke is present indoors and is making you ill. If visibility is less than 5 miles in smoke in your neighborhood, smoke has reached levels that are unhealthy.
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