During ozone season, it’s especially important to stay informed on the Air Quality Index (AQI) each day. The AQI is a tool developed by the U.S. Environmental Protection Agency to communicate the health impacts of outdoor air quality. It measures five major air pollutants: ground-level ozone, particulate matter, carbon monoxide, nitrogen dioxide, and sulfur dioxide.
Air quality monitors throughout our region collect data daily. Based on this data, the AQI is assigned to one of six color-coded categories, each representing a range of values and a corresponding level of health concern. The color makes it easy for people to quickly determine whether air quality is reaching unhealthy levels in their communities. The higher the AQI number, the greater the level of air pollution and potential impact on health. Learn more and check the current AQI at AirNow.gov.
Summer often brings more air quality concerns due to increased ozone levels, as warmer temperatures and strong sunlight can lead to higher formation of ground-level ozone. Ozone season in Colorado runs from April through October, making it critical to check the AQI regularly—especially if you have a respiratory condition or other health concerns. The AQI can help you decide whether it’s a good day to spend time outdoors or take other precautions.
In 2024, the Pikes Peak Region experienced 13 ozone exceedance days—days when ozone levels surpassed national standards. Ozone can be harmful to everyone, but even when the AQI stays in the moderate range, it can pose greater risks to sensitive groups such as children, older adults, and those with pre-existing health issues.
Stay connected and keep the Air Quality Index handy:
For the 2025 ozone season, the Colorado Department of Public Health and Environment (CDPHE) sends daily email updates from May 31 to August 31. If air pollution levels are forecasted to exceed national standards, you’ll receive an “Ozone Action Day Alert.” You can subscribe to receive alerts for your area here and sign up for EnviroFlash emails to get daily air quality forecasts delivered directly to your inbox.
Many weather apps offer AQI readings, and these can be based on a variety of data sources. AirNow and the AirNow app is managed by the EPA and is a reliable source for AQI information. AirNow features real-time AQI data and an interactive map to help you monitor local air quality conditions.
For more information about local ozone trends and tips on reducing ozone, visit PikesPeakAir.com. You can also learn more with the Colorado Department of Public Health and Environment’s Ozone resources.