Air Quality Alert: Denver-Boulder Area Reaches Unhealthy for Sensitive Groups Level
On March 20, 2026, air quality in the Denver-Boulder area reached an AQI of 128, categorized as Unhealthy for Sensitive Groups due to PM10 levels.
Current Air Quality
The Denver-Boulder area in Colorado reported an Air Quality Index (AQI) of 128 on March 20, 2026. The primary pollutant of concern is PM10, which has reached the “Unhealthy for Sensitive Groups” category. Other readings for the area include PM2.5 at an AQI of 70 (Moderate) and Ozone (O3) at an AQI of 47 (Good).
What This Means
An AQI level of 128 is classified by the EPA as “Unhealthy for Sensitive Groups.” This category indicates that air quality is reaching levels where members of sensitive groups may experience health effects, though the general public is less likely to be affected.
Who Should Take Precautions
Groups at increased risk from this level of particle pollution include people with heart or lung disease, older adults, children, and teenagers. These individuals should be mindful of their outdoor activities while these conditions persist.
What You Should Do
Members of sensitive groups should reduce prolonged or heavy exertion outdoors. It is recommended to take more breaks and engage in less intense outdoor activities. Watch for symptoms such as coughing or shortness of breath. The general public can continue normal outdoor activities.
Source
Data provided by EPA AirNow.
Source: EPA Official Notice
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