Air Quality Alert: Denver-Boulder Reaches Very Unhealthy Levels for PM10
Areazine synthesizes this EPA air-quality advisory directly from EPA's official public data feed. See our methodology for full source attribution and refresh cadence.
On February 25, 2026, air quality in the Denver-Boulder area reached 'Very Unhealthy' levels, with PM10 recorded at an AQI of 287.
What this EPA air-quality advisory tells you, and what most readers miss
This notice was issued by EPA on April 6, 2026 and geographically references Denver-Boulder, CO. Its severity classification of "high" signals how the issuing agency weighs the risk of harm if no action is taken - "critical" and "high" tier alerts typically carry direct consumer actions, while "medium" and "low" tend toward informational guidance or monitoring advisories. The category it belongs to - Air Quality - determines the informational context it sits in, and which agency or body is the authoritative source for updates.
Most readers skim a notice like this, check whether they are personally affected, and move on. The more useful lens is to verify its scope, source, and timestamp, then compare related notices without assuming that one record proves a broader trend.
Areazine pairs this record with the original agency URL so you can check the primary source before acting. Its related labels are air-quality, epa, aqi, Denver-Boulder.
Current Air Quality
In the Denver-Boulder, CO reporting area, air quality observations for February 25, 2026, indicate significant concerns regarding particulate matter. The primary pollutant is PM10, which has reached an Air Quality Index (AQI) of 287, placing it in the "Very Unhealthy" category. Other measured pollutants include PM2.5 at an AQI of 64 (Moderate) and Ozone (O3) at an AQI of 38 (Good).
What This Means
An AQI of 287 is classified as "Very Unhealthy" by the EPA. This level indicates that the risk of health effects is increased for everyone, as air quality conditions are significantly degraded.
Who Should Take Precautions
While sensitive groups—including children, older adults, and people with heart or lung disease—are at the highest risk, the general public may also experience health effects when air quality reaches the "Very Unhealthy" level.
What You Should Do
To protect your health, the EPA recommends that everyone reduce outdoor physical activity. Sensitive groups should avoid all outdoor physical activity and move activities indoors or reschedule them to a time when air quality has improved. All others should avoid prolonged or heavy exertion and consider moving activities indoors.
Source
Data provided by EPA AirNow.
Original source: EPA Official Notice ↗
Related Air Quality
All Air Quality →Frequently Asked Questions
Common questions about this EPA air-quality advisory.