Air quality in Calaveras County, California, United States of America today
Mr. Duck’s Air Quality Score
Moderate air today for Calaveras County, 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 today in Calaveras County is classified as Moderate. The primary pollutant identified is PM2.5 (fine particles).
Measurements from three monitoring stations show a PM2.5 reference value of 10.0 and a PM10 reference value of 14.0. These values are based on the latest data available through OpenAQ. 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 dataset for Calaveras County contains a single monitoring location – the San Andreas station – that reports three pollutants: ozone (O₃), particulate matter up to 10 µm (PM10) and fine particulate matter up to 2.5 µm (PM2.5). All three measurements were last updated on 2026‑02‑10 at 23:00 UTC, which falls within the “updated within 7 days” freshness category, so the data are relatively current for this site.
Because there is only one row of observations, each pollutant shows a single recorded value rather than a range. Ozone is measured at 0.029 ppm, PM10 at 14.0 µg/m³ and PM2.5 at 10.0 µg/m³; the minimum, median, maximum, 10th‑percentile and 90th‑percentile statistics are identical for each pollutant, reflecting the lack of variability in this snapshot. Consequently, the dataset does not provide insight into temporal fluctuations or spatial differences across Calaveras County – it captures only the conditions at one place and moment.
Overall, the data coverage is limited to a single sensor location with all three pollutants reported simultaneously. While the timestamps are fresh, the absence of additional stations means that broader county‑wide air quality patterns cannot be inferred from this set alone. Users should keep in mind that conditions may differ elsewhere in Calaveras County and at other times, even though the available measurements are up to date for the San Andreas site.
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 for Calaveras County reflects three valid measurements and was updated within 3 days, with the most recent reading recorded on 2026‑02‑10 at 23:00 UTC. This snapshot provides a brief view of current conditions; however, air quality can differ across neighborhoods and change rapidly throughout the day, so values may not represent every location or moment in the county.
OpenAQ station rows
| Station | Parameter | Value | Unit | Last updated |
|---|---|---|---|---|
| San Andreas | o3 | 0.029 | ppm | 2026-02-10 23:00 UTC |
| San Andreas | pm10 | 14.0 | µg/m³ | 2026-02-10 23:00 UTC |
| San Andreas | pm25 | 10.0 | µg/m³ | 2026-02-10 23:00 UTC |