Denver, Colorado – Hot, stagnant air is expected to drive ozone levels into unhealthy territory for sensitive groups across the Denver metro and Front Range through 4 p.m. Thursday, prompting health officials to issue an Ozone Action Day Alert.
According to the Colorado Department of Public Health and Environment, residents in Denver, Boulder, Broomfield, Douglas, Jefferson, western Arapahoe, western Adams, Larimer, and Weld counties should reduce gas and diesel vehicle use and limit outdoor activity—especially for those with asthma, lung disease, or children and older adults.
Air quality is expected to worsen Thursday as winds calm and temperatures rise, creating ideal conditions for ground-level ozone to form. The alert recommends staying indoors during peak afternoon hours and postponing activities like lawn mowing or fueling vehicles until after 4 p.m.
Health impacts may include increased respiratory symptoms and breathing discomfort, particularly for sensitive individuals. Residents can check real-time conditions and learn how to help reduce pollution at colorado.gov/airquality.
The alert may extend if poor air quality persists. Officials will update conditions Thursday afternoon.
