Air quality in Cupertino, California, United States of America today
Mr. Duck’s Air Quality Score
Good air today for Cupertino, California, United States of America
This friendly indicator summarizes the latest city readings. For health guidance, please see: EPA AirNow or WHO.
Air quality today
The air quality in Cupertino today is classified as Good. The primary pollutant identified is PM2.5, with a measured concentration of 3.79 µg/m³ based on four valid observations reported through OpenAQ.
Overall conditions meet the criteria for a Good rating, reflecting low levels of fine particulate matter. This page is informational; for health guidance, use official sources such as EPA AirNow or WHO.
Latest sensor values
PM categories follow US EPA AQI breakpoints, shown here as an estimate derived from the latest valid measurements (this project does not compute EPA NowCast/24-hour AQI yet).
What the data includes
The current station data listed for this city is focused on particulate matter (PM). Only PM2.5 measurements are available, coming from four sensor rows that together represent the full set of reported stations in Cupertino. All four entries have been updated within the past seven days, with the most recent timestamp recorded on 2026-02-10 23:04 UTC, so the dataset reflects very recent conditions.
Across these four locations the observed PM2.5 concentrations range from a low of 3.49 µg/m³ to a high of 5.69 µg/m³, with a median value of 3.76 µg/m³. The 10th percentile sits at about 3.56 µg/m³ and the 90th percentile at roughly 5.12 µg/m³, indicating that most readings cluster in the low‑to‑mid single digits. One specific reading from the Cupertino City Hall sensor shows 3.79 µg/m³ as of the latest update. Because the coverage is limited to a single pollutant and only four recent rows, conditions elsewhere in the city or at different times may differ from what these stations capture.
Learn more about sources and filtering: About the data.
Trusted references: WHO (Air pollution) · US EPA AirNow · European Environment Agency (Air)
Latest sensor values (bars)
PM categories follow US EPA AQI breakpoints, shown here as an estimate derived from the latest valid measurements (this project does not compute EPA NowCast/24-hour AQI yet).
Data notes
The data shown reflects four valid measurements and is updated within three days, with the most recent reading recorded on 2026‑02‑10 at 23:04 UTC. This snapshot provides a current view of air quality across Cupertino, California, but conditions can differ by neighborhood and change throughout the day, so local variations may exist beyond what is displayed here.
OpenAQ station rows
| Station | Parameter | Value | Unit | Last updated |
|---|---|---|---|---|
| N Foothhill Blvd | pm25 | 3.73 | µg/m³ | 2026-02-10 23:00 UTC |
| Cupertino City Hall | pm25 | 3.79 | µg/m³ | 2026-02-10 23:04 UTC |
| JFK Middle School | pm25 | 5.69 | µg/m³ | 2026-02-10 22:53 UTC |
| Environment Education Center | pm25 | 3.49 | µg/m³ | 2026-02-10 22:57 UTC |