San Jose Air Quality Alert: PM2.5 Levels Reach Unhealthy for Sensitive Groups
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 21, 2026, air quality in San Jose, CA reached an AQI of 107 for PM2.5, categorized as Unhealthy for Sensitive Groups.
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 San Jose, CA. Its severity classification of "low" 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, San Jose.
Current Air Quality
In San Jose, CA, the air quality was monitored on February 21, 2026. The primary pollutant of concern is fine particulate matter (PM2.5), which recorded an Air Quality Index (AQI) of 107, falling into the "Unhealthy for Sensitive Groups" category. Ozone (O3) levels were also measured at an AQI of 36, which is categorized as "Good."
What This Means
An AQI between 101 and 150 is considered "Unhealthy for Sensitive Groups." At this level, members of sensitive groups may experience health effects, though the general public is less likely to be affected.
Who Should Take Precautions
Groups at higher risk include people with heart or lung disease, older adults, children, and teenagers. These individuals are more sensitive to the effects of fine particulate matter (PM2.5).
What You Should Do
Sensitive groups should reduce prolonged or heavy outdoor exertion. 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 does not need to take special precautions at this AQI level.
Source
Data attributed to EPA AirNow.
Original source: EPA Official Notice ↗
Related Air Quality
All Air Quality →Nationwide notices with similar length or severity timing 8
Two Areazine-derived peer sets for this EPA air-quality advisory: nearest notices by body length and by same severity near the same agency date. Peers come from other categories so they are not the same-feed Related list above.
Similar body length
Nearest notices by article body length (1,169 characters here).
Similar severity timing
Same severity (low) notices issued closest in time to April 6, 2026.
Frequently Asked Questions
Common questions about this EPA air-quality advisory.