Active AlertsBoulder

The Colorado Department of Public Health and Environment has issued the following
What: Action Day Alert for Multiple Pollutants.
Where: Douglas, Jefferson, Denver, western Arapahoe, western Adams, Broomfield, Boulder, Larimer, and Weld Countie
S When: 400 PM Monday June 29 to 400 PM Tuesday June 30
Impacts: Ozone Action Day Alert is now in effect for the Front Range Urban Corridor. Hot, sunny, and occasionally smoky weather conditions will result in ozone concentrations occasionally reaching the Unhealthy for Sensitive Groups category on Monday and Tuesday. Particle pollution levels could also reach the Unhealthy for Sensitive Groups category, or worse, due to the wildfire smoke. 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. Tuesday, June 30, 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.