Air quality in Clallam County, Washington, United States of America today
Mr. Duck’s Air Quality Score
Good air today for Clallam County, 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 Clallam County, Washington is classified as Good today.
The primary pollutant measured is PM2.5 (fine particles). The latest reading shows a concentration of 1.5 µg/m³ based on one valid measurement. Data is shown via OpenAQ. 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 data set for Clallam County includes measurements of five pollutants – carbon monoxide (CO), nitrogen oxide (NO), ozone (O₃), fine particulate matter (PM2.5) and sulfur dioxide (SO₂). These values come from six individual rows of sensor readings that are grouped into two monitoring stations, so the coverage is limited to a small number of locations within the county.
The most recent observation in the whole collection is for PM2.5, recorded at Neah Bay 2‑Makah Tri on 2026-02-10 23:00 UTC with a value of 1.5 µg/m³; this entry is flagged as having been updated within the past seven days. All other pollutants were last reported on 2025-02-27 02:00 UTC, which classifies them as “old” data. For CO the range is a single point at 0.1 ppm, for NO it is uniformly 0.0 ppm, for O₃ it sits at 0.036 ppm, and for SO₂ it is recorded at 0.0001 ppm. Because each of these gases appears in only one row, the median, minimum and maximum values are identical, indicating no observed variability across the sampled sites.
Overall, the dataset shows a stark contrast between the freshness of PM2.5 data and the staleness of the gas‑phase measurements. With just two stations contributing, many parts of Clallam County are not represented, and conditions can differ substantially by location and time. Users should keep in mind that the available numbers provide only a snapshot from a very limited spatial network rather than a comprehensive picture of air quality across the entire county.
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 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 rapidly throughout the day, so values may vary locally and over short time periods.
OpenAQ station rows
| Station | Parameter | Value | Unit | Last updated |
|---|---|---|---|---|
| Neah Bay 2-Makah Tri | pm25 | 1.5 | µg/m³ | 2026-02-10 23:00 UTC |
| Cheeka Peak | co | 0.1 | ppm | 2025-02-27 02:00 UTC |
| Cheeka Peak | no | 0.0 | ppm | 2025-02-27 02:00 UTC |
| Cheeka Peak | o3 | 0.036 | ppm | 2025-02-27 02:00 UTC |
| Cheeka Peak | pm25 | 1.4 | µg/m³ | 2025-02-27 02:00 UTC |
| Cheeka Peak | so2 | 0.0001 | ppm | 2025-02-27 02:00 UTC |