Air quality in Belvedere, California, United States of America today

Mr. Duck’s Air Quality Score

Moderate air today for Belvedere, California, United States of America

⚠️ This website is currently under active development. Some data may be incomplete or temporarily inaccurate. For health-critical decisions, please verify information through official government or environmental sources.

Categories follow US EPA AQI breakpoints for PM (estimate from latest valid measurements; this project does not compute EPA NowCast/24-hour AQI yet).

This friendly indicator summarizes the latest city readings. For health guidance, please see: EPA AirNow or WHO.

Air quality today

The air quality in Belvedere today is classified as Moderate. The primary pollutant identified is PM2.5 (fine particles).

Measurements from five valid monitoring points show a PM2.5 concentration of 16.675 µg/m³. No PM10 value is available for this assessment. 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 Belvedere pulls from two monitoring stations that together provide eleven individual rows of measurements. Five of those rows have been updated within the past seven days, while the remaining six are older than a month, so the most recent data points date to 2026‑02‑11 00:00 UTC. All five pollutants measured at the Belvedere site—PM1, PM2.5, PM10, relative humidity, temperature and UM003 (particle count)—are included, with an additional PM10 reading from a nearby Corinthian Island station dated 2025‑01‑13 23:00 UTC.

Across the recent Belvedere rows, PM1 values range from about 3.17 to 10.14 µg/m³, with a median of 6.66 µg/m³; PM2.5 spans 6.24 to 16.68 µg/m³ and a median of 11.46 µg/m³, showing a broader spread toward higher concentrations. Relative humidity stays tightly clustered between 63.67 % and 65.77 %, median 64.72 %; temperature varies only slightly from 15.59 °C to 15.80 °C, median 15.70 °C. The particle‑count metric UM003 ranges widely from 658 to 1 747 particles/cm³, with a median of about 1 203, indicating notable fluctuations in airborne particle density.

Because half of the rows are older than thirty days, the snapshot does not capture day‑to‑day variability for all parameters. The data set therefore reflects recent conditions for PM1, PM2.5, humidity, temperature and UM003, but relies on a single older PM10 measurement from a neighboring location to fill that gap. Users should keep in mind that air quality can differ across neighborhoods and over time, and the available numbers represent the specific moments when each sensor last reported.

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 Belvedere reflects five valid measurements and was updated today (2026‑02‑11T00:00:00+00:00). While these readings provide a current snapshot of ambient conditions, air quality can differ across neighborhoods and change throughout the day, so this information represents an approximate view rather than a precise, citywide constant.

OpenAQ station rows