Air quality in Chehalis, Washington, United States of America today
Mr. Duck’s Air Quality Score
Good air today for Chehalis, Washington, 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 in Chehalis today is classified as Good. The primary pollutant measured is PM2.5, with a reported concentration of 2.7 µg/m³.
Data for this assessment are provided via OpenAQ and reflect a single valid measurement taken on 2026-02-14. 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 current station data listed for this city is focused on particulate matter (PM). Only one monitoring location contributes to the OpenAQ feed for Chehalis, Washington, and it records a single pollutant: PM2.5. The most recent measurement was taken on 2026-02-10 23:00 UTC, which falls within the “updated within 7 days” freshness category, indicating that the available reading is relatively current.
Because there is just one row of data, the reported range for PM2.5 is narrow—both the minimum and maximum values are 2.7 µg/m³, and the median matches this figure as well. This uniformity reflects the limited spatial coverage rather than a stable ambient condition; other parts of Chehalis may experience different concentrations that are not captured here. With only a single station providing data, any assessment of city‑wide air quality must acknowledge this constraint and recognize that conditions can vary by location and time beyond what is shown in the present dataset.
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 Chehalis reflects a single valid measurement and is updated within 3 days, with the most recent reading recorded on 2026‑02‑10 at 23:00 UTC. This snapshot provides a brief view of current conditions; however, air quality can differ across neighborhoods and change throughout the day, so local variations may not be captured in this single point-in-time report.
OpenAQ station rows
| Station | Parameter | Value | Unit | Last updated |
|---|---|---|---|---|
| Chehalis-Market Blvd | pm25 | 2.7 | µg/m³ | 2026-02-10 23:00 UTC |