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

Mr. Duck’s Air Quality Score

Unhealthy for sensitive groups for Davis, 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 Davis today is classified as USG. The primary pollutant identified is PM2.5 (fine particles). Measurements show a PM2.5 concentration of 35.45 µg/m³ based on eleven valid readings reported through OpenAQ.

These values reflect the current monitoring snapshot for the city. 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 Davis air‑quality dataset draws from three monitoring sites and a total of thirteen recorded rows. All six pollutants tracked by OpenAQ are represented: fine particles (PM2.5), ultrafine particles (PM1), coarse dust (PM10), relative humidity, temperature, and particle count (UM003). For most variables the newest measurements were taken on 2026‑02‑11 at 00:00 UTC, showing that the data is generally fresh; the exception is PM10, whose latest entry dates back to 2025‑01‑13 at 23:00 UTC, indicating a gap of more than a year for that metric.

Across the recent observations the values span modest ranges. PM2.5 median concentration sits at 27.80 µg/m³ with a minimum of 24.77 and a maximum of 35.45 µg/m³, while the 10th‑percentile (25.38) and 90th‑percentile (33.92) suggest most readings cluster within roughly ±4 µg/m³ of the median. PM1 shows an even tighter spread: values range from 22.00 to 22.79 µg/m³, with a median of 22.40 µg/m³ and percentiles that differ by less than one µg/m³. In contrast, UM003 particle counts vary widely, from about 1,148 to 3,903 particles/cm³; the median (2,525) sits roughly midway between the lower and upper deciles (1,423 and 3,627), reflecting considerable fluctuation in airborne particle numbers.

Relative humidity and temperature are also up‑to‑date. Humidity measurements range from 54.88 % to 57.51 %, with a median of 56.20 %; temperature values sit between 15.90 °C and 16.48 °C, medianing at 16.19 °C. The dataset therefore provides a recent snapshot for most pollutants, but the older PM10 record highlights uneven temporal coverage. Users should keep in mind that conditions can differ across Davis neighborhoods and over time, especially for metrics with fewer or dated observations.

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 Davis, California reflects 11 valid measurements and was Updated today (last refreshed at 2026-02-11T00:00:00+00:00). This snapshot provides a current view of ambient air quality across the city, but conditions can differ by neighborhood, time of day, and local sources. Users should consider these variations when interpreting the values presented here.

OpenAQ station rows