Denver’s air quality today is classified as Moderate, based on measurements and forecasts for ozone and particulate matter in the region. The latest data show the highest Ozone Air Quality Index, or AQI, reached 93 in the evening hours of July 25th, indicating moderate ozone pollution. Meanwhile, the AQI for fine particulate matter, known as PM2.5, was 55, also within the moderate range.

Moderate air quality means the air is generally acceptable, but there may be a risk for some people. Sensitive groups—such as children, older adults, and those with respiratory conditions like asthma—should consider limiting prolonged or heavy outdoor activity, especially from noon to 8 pm. In these conditions, active children, healthy adults, and anyone with lung or heart diseases may experience mild symptoms or worsening of preexisting conditions. Air quality authorities have issued an Ozone Action Day Alert, encouraging all residents to avoid rigorous outdoor activities during the heat of the day.

For fine particulate matter, unusually sensitive individuals are advised to reduce extended outdoor exertion, though most people will not be affected. Carbon monoxide and nitrogen dioxide levels are both in the Good category and not expected to pose any health risks today.

Visibility in Denver is expected to be moderate. The main health concern for the day remains ground-level ozone, which is formed from vehicle emissions and industrial pollution reacting with sunlight. Exposure to elevated ozone levels may cause acute respiratory effects, trigger asthma attacks, and potentially cause lasting lung damage with prolonged high exposure.

In summary, Denver residents are advised to stay informed and follow health recommendations, particularly if they are part of a sensitive group. For the general population, outdoor activities are safe but avoiding peak afternoon hours is recommended for those at higher risk. The air pollution risk today is moderate, and most people will not experience symptoms, but precautions are suggested for those unusually sensitive or with underlying health issues. The Ozone Action Day Alert for the Front Range will remain in effect until at least this afternoon to ensure public health guidance is followed.