Air quality in Castrillón, Asturias, Spain today
Mr. Duck’s Air Quality Score
Good air today for Castrillón, Asturias, Spain
This friendly indicator summarizes the latest city readings. For health guidance, please see: EPA AirNow or WHO.
Air quality today
The air quality in Castrillón today is classified as Good. The main pollutant identified is PM2.5 (fine particles). Measurements show a PM2.5 reference value of 3.0 and a PM10 reference value of 13.0, based on four valid observations recorded through OpenAQ.
This assessment reflects the current monitoring data 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 air‑quality record for Castrillón draws on six recent observations collected at the SALINAS monitoring site. All six standard pollutants are represented: carbon monoxide (CO), nitrogen monoxide (NO), nitrogen dioxide (NO₂), ozone (O₃), particulate matter ≤ 10 µm (PM₁₀) and particulate matter ≤ 2.5 µm (PM₂.₅). Five of the six rows have been updated within the last seven days, while one entry – the NO measurement – dates back to 2024‑01‑31, making it the only “old” record in the set.
The data show a very narrow spread for each pollutant because every metric has a single reported value. CO registers at 480 µg/m³, NO at 3 µg/m³, NO₂ at 11 µg/m³, O₃ at 49 µg/m³, PM₁₀ at 13 µg/m³ and PM₂.5 at 3 µg/m³; the minimum, median and maximum are identical for each. This uniformity reflects that only one recent reading per pollutant is available rather than a time series.
Overall freshness is good for most compounds – the latest timestamps are 2026‑02‑09 15:00 UTC for CO, NO₂ and O₃, and 2026‑02‑09 03:00 UTC for PM₁₀ and PM₂.5. The lone older entry (NO) was last refreshed on 2024‑01‑31 00:00 UTC. Because the dataset consists of a single monitoring location, conditions can differ across other parts of Castrillón or at different times of day, so these figures represent only the moment captured at SALINAS rather than a comprehensive citywide picture.
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 Castrillón are based on four valid measurements and have been refreshed recently, with the latest update recorded at 2026‑02‑09T15:00:00+00:00 (Updated within 3 days). This snapshot reflects conditions captured at that time; air quality can vary across different neighborhoods and throughout the day, so values may differ from what you experience in other parts of the city.
OpenAQ station rows
| Station | Parameter | Value | Unit | Last updated |
|---|---|---|---|---|
| SALINAS | no | 3.0 | µg/m³ | 2024-01-31 00:00 UTC |
| SALINAS | no2 | 11.0 | µg/m³ | 2026-02-09 15:00 UTC |
| SALINAS | o3 | 49.0 | µg/m³ | 2026-02-09 15:00 UTC |
| SALINAS | pm10 | 13.0 | µg/m³ | 2026-02-09 03:00 UTC |
| SALINAS | pm25 | 3.0 | µg/m³ | 2026-02-09 03:00 UTC |