Air quality in Butte County, California, United States of America today
Mr. Duck’s Air Quality Score
Moderate air today for Butte 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 Butte County, California is rated as Moderate. The primary pollutant identified is PM2.5 (fine particles). Measurements show a PM2.5 concentration of 20.80 µg/m³ based on six valid observations reported through OpenAQ.
This assessment reflects the current monitoring data without speculation about causes or future conditions. 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 Butte County includes five distinct monitoring stations that together contribute nine individual rows of measurements. Five different pollutants are represented: fine particulate matter (PM2.5), coarse particles (PM1), relative humidity, temperature and particle count (UM003). The most recent data point across all parameters was recorded on 2026-02-11 at 01:00 UTC, so the newest timestamps are just a few days old. Six of the nine rows were updated within the last seven days, while the remaining three are older than that window.
PM2.5 values range from a low of 0 µg/m³ to a high of 22 µg/m³, with a median of 5 µg/m³ and a 10th‑percentile of about 1.6 µg/m³; the most recent reading at the Cohasset site is 20.800666681925456 µg/m³. PM1 measurements are far less variable, showing a single recorded value of 8.602833334604899 µg/m³ at Cohasset. Relative humidity and temperature each have only one reported figure, both from Cohasset: 53.18966662089031 % humidity and 13.123833370208741 °C respectively. Particle concentration (UM003) is also a single value of 677.1584976196289 particles/cm³ at the same location.
The coverage across pollutants is uneven: while PM2.5 has multiple observations allowing an assessment of spread, the other four parameters are represented by just one data point each, limiting insight into spatial or temporal variation. Because three rows are older than a week, conditions in parts of the county may not be captured in real time, and the single‑site dominance (Cohasset) means that citywide air quality can differ from what these numbers show at any given moment.
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 six valid measurements and was updated today (2026‑02‑11T01:00:00+00:00). While this snapshot provides a current view of air quality for Butte County, California, conditions can differ across neighborhoods and change throughout the day, so values may not represent every location or moment within the city.
OpenAQ station rows
| Station | Parameter | Value | Unit | Last updated |
|---|---|---|---|---|
| Gridley | pm25 | 22.0 | µg/m³ | 2026-02-10 23:00 UTC |
| MMCA81010 | pm25 | 4.0 | µg/m³ | 2019-11-05 20:00 UTC |
| MMCA81041 | pm25 | 5.0 | µg/m³ | 2020-04-01 16:00 UTC |
| MMCA81048 | pm25 | 0.0 | µg/m³ | 2020-06-03 20:00 UTC |
| Cohasset | pm1 | 8.602833334604899 | µg/m³ | 2026-02-11 01:00 UTC |
| Cohasset | pm25 | 20.800666681925456 | µg/m³ | 2026-02-11 01:00 UTC |
| Cohasset | relativehumidity | 53.18966662089031 | % | 2026-02-11 01:00 UTC |
| Cohasset | temperature | 13.123833370208741 | c | 2026-02-11 01:00 UTC |
| Cohasset | um003 | 677.1584976196289 | particles/cm³ | 2026-02-11 01:00 UTC |