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

Mr. Duck’s Air Quality Score

Moderate air today for Chico, 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 Chico today is rated as Moderate. The primary pollutant identified is PM2.5 (fine particles). Measurements show a PM2.5 concentration of 18.33 µg/m³ and a PM10 level of 17.0 µg/m³, based on eight valid observations collected through OpenAQ.

Data reflect the current conditions without additional interpretation. 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 Chico includes measurements of carbon monoxide (CO), nitric oxide (NO), nitrogen dioxide (NO2), total oxides of nitrogen (NOX), ozone (O3), particulate matter ≤ 10 µm (PM10) and particulate matter ≤ 2.5 µm (PM2.5). Across the city three monitoring sites contribute nine individual rows of data, giving a modest spatial snapshot of air quality.

The most recent observations were recorded on 2026‑02‑10 at 23:00 UTC for all pollutants except CO, whose latest entry dates from 2025‑04‑16 at 22:00 UTC. This means that while the majority of the dataset is fresh (within the past week), carbon monoxide information is older by several months. For PM2.5, values range from a low of 8.7 µg/m³ to a high of 18.33 µg/m³, with a median of about 17.96 µg/m³; the 10th and 90th percentiles sit at roughly 10.55 µg/m³ and 18.26 µg/m³ respectively, indicating limited variability in recent measurements. PM10 is reported as a single constant value of 17.0 µg/m³, reflecting only one recent reading.

Gaseous pollutants show uniformity across the latest sample: CO is recorded at 0.2 ppm, NO at 0.0012 ppm, NO2 at 0.0034 ppm, NOX at 0.0046 ppm and O3 at 0.031 ppm, each with no observed spread in the current data window. Because most pollutants have only one recent value, the dataset captures a narrow moment in time rather than a broader trend. Consequently, while the available numbers give a clear picture of conditions on 10 February 2026 for most species, they do not reflect longer‑term fluctuations or variations across different neighborhoods within Chico.

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 eight valid measurements and is updated within 3 days, with the most recent reading recorded on 2026‑02‑10 at 23:05 UTC. This snapshot provides a current view of Chico’s air quality but conditions can differ across neighborhoods and change throughout the day, so local variations may not be captured in these figures.

OpenAQ station rows