AQI Alerts for Denver Centennial Arpt, CO

# HEADLINE -------------------- ACTION DAY FOR MULTIPLE POLLUTANTS FROM 400 PM SUNDAY UNTIL 400 PM MONDAY # SUMMARY -------------------- The Colorado Department of Public Health and Environment has issued the following... WHAT...Action Day for Multiple Pollutants. # DETAILS -------------------- WHERE Douglas, Jefferson, Denver, western Arapahoe, western Adams, Broomfield, Boulder, Larimer, and Weld Counties WHEN 400 PM Sunday June 28 to 400 PM Monday June 29 IMPACTS Action Day for Multiple Pollutants is now in effect for the Front Range Urban Corridor. Increasing wildfire smoke is possible Sunday afternoon and evening, especially in and near Denver and the local foothills to the west of the metro area. Another plume of wildfire smoke could impact the entire northern Front Range region Monday afternoon and evening. Both ozone and fine particulates could reach the Unhealthy for Sensitive Groups category or higher. 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, June 29, 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 People with heart or lung disease, older adults, and children should reduce prolonged or heavy exertion. During periods of heavier wildfire smoke, everyone should reduce prolonged or heavy exertion. ISSUED AT Sunday, June 28, 2026 at 4:10 PM MDT ISSUED BY Relayed by National Weather Service Boulder CO HEADER Air Quality Alert Message | Colorado Department of Public Health and Environment # AREAS AFFECTED -------------------- Boulder, Adams, Arapahoe, Broomfield, Denver, Douglas, Jefferson, Larimer, Weld