Air Quality Alert: Boulder, CO; Weld, CO; Adams, CO; Arapahoe, CO; Douglas, CO; Larimer, CO; Jefferson, CO; Denver, CO; Broomfield, CO

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Air Quality Alert — Boulder, CO; Weld, CO; Adams, CO; Arapahoe, CO; Douglas, CO; Larimer, CO; Jefferson, CO; Denver, CO; Broomfield, CO Severity: Unknown. Certainty: Unknown. The Colorado Department of Public Health and Environment has issued the following... WHAT...Action Day for Multiple Pollutants. WHERE...Douglas, Jefferson, Denver, western Arapahoe, western Adams, Broomfield, Boulder, Larimer, and Weld Counties WHEN...400 PM Friday August 07 to 400 PM Saturday August 08 IMPACTS...Action Day for Multiple Pollutants is now in effect for the Front Range Urban Corridor. Ozone is expected to be in the Moderate to Unhealthy for Sensitive Groups range on Thursday and Friday. The highest concentrations of ozone are most likely in the southern and western portions of the Denver Metro area. Fine particulate concentrations are expected to be in the Moderate to Unhealthy for Sensitive Groups range on Thursday and Friday. 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. Saturday, August 8, 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.