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

Mr. Duck’s Air Quality Score

Good air today for Berkeley, 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

Today's air quality in Berkeley is classified as Good. The primary pollutant measured is PM2.5, with a reported concentration of 4.09 µg/m³ based on 21 valid observations. PM10 values are not available for this reporting period.

The set of 21 valid measurements provides a snapshot of particulate levels across the monitoring network. No other pollutants reached the reporting threshold. Data is shown via OpenAQ. The reported PM2.5 concentration of 4.09 µg/m³ is expressed in micrograms per cubic meter, a standard unit for particulate matter. These figures represent the ambient air quality observed across the city during the latest sampling interval. The monitoring sites are distributed to capture variations in urban and suburban environments. Overall, the dataset indicates low particulate concentrations relative to typical urban levels. 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 Berkeley air‑quality feed currently contains 26 data rows collected from nine monitoring stations. Twenty‑one of those rows have been updated within the past 30 days, while five rows lack a recent timestamp, so the newest measurements are no older than a month. The dataset includes eight measured variables: particulate matter PM2.5, PM1, the particle count UM003, relative humidity, temperature, black carbon (BC), carbon monoxide (CO) and nitric oxide (NO). Sensors for nitrogen dioxide, nitrogen oxides and ozone are not represented in the present records.

For PM2.5 the most recent value is 4.09 µg/m³ recorded at station 465B on 2026‑02‑11 00:00 UTC; the full set of 26 rows shows a median of 8.18 µg/m³, a minimum of 0 µg/m³ and a maximum of 15.66 µg/m³, with the 10th and 90th percentiles at 3.68 µg/m³ and 15.32 µg/m³ respectively. Relative humidity peaks at 62.48 % (Berkeley, 2026‑02‑11 01:00 UTC) and falls to 22.06 %, with a median of 45.42 % across the same 26 rows. Temperature ranges from a low of 15.21 °C (Berkeley, 2026‑02‑11 01:00 UTC) to a high of 36.75 °C, median 20.44 °C. PM1, reported from two rows, reaches a maximum of 3.03 µg/m³ (Berkeley, 2026‑01‑27 10:00 UTC) and a median of 1.52 µg/m³. The UM003 particle count also comes from two rows, with a maximum of 34.41 particles/cm³ and a median of 17.20 particles/cm³. BC, CO and NO each have a single recent reading (0.47 µg/m³, 0.5 ppm and 0.0124 ppm respectively, all from the Berkeley Aquatic Par station on 2026‑02‑10 01:00 UTC).

Overall, the data provide a fairly recent snapshot of several key pollutants, but coverage is uneven: some variables are measured at many stations, while others rely on a single sensor, and several common urban pollutants (NO₂, NOₓ, O₃) are absent from the current feed. Consequently, the picture of Berkeley’s air quality may vary across locations and times not captured by the existing rows.

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 dataset for Berkeley, California includes 21 valid measurements and is Updated within 30 days. The most recent data were recorded on 2026-02-11T01:00:00+00:00. This snapshot reflects conditions at the time of collection; air quality can vary by location and time within the city, so values may differ across neighborhoods and throughout the day.

OpenAQ station rows