San Jose Air Quality Alert: PM2.5 Levels Reach Unhealthy for Sensitive Groups

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.