Denver, CO – Residents across the Denver metro area are being urged to limit outdoor activity and vehicle use as the Colorado Department of Public Health and Environment (CDPHE) issued an Ozone Action Day Alert effective through midnight.
The alert, which began at 4 p.m. Monday, covers nine counties along the Front Range Urban Corridor including Denver, Broomfield, Boulder, Douglas, Jefferson, Larimer, Weld, and parts of Arapahoe and Adams counties.
According to the CDPHE, hot and stagnant weather conditions are driving elevated ozone levels, particularly in southern and western parts of the Denver metro area and nearby foothills. Air quality is expected to reach the “Unhealthy for Sensitive Groups” category Monday afternoon and evening. Individuals with respiratory conditions such as asthma, along with active children and adults, are advised to limit prolonged outdoor exertion during this period.
While ozone levels are expected to improve into the “Good to Moderate” range on Tuesday, officials are encouraging residents to take immediate action by reducing the use of gas and diesel-powered vehicles through Monday night.
For more information on current air quality, health guidance, and tips to reduce ozone pollution, visit Colorado Air Quality or CDPHE’s ozone education page.
The alert is part of Colorado’s ongoing efforts to address air pollution and protect public health through both voluntary measures and evolving state policy.
