Air quality in Castro-Urdiales, Cantabria, Spain today
Mr. Duck’s Air Quality Score
Good air today for Castro-Urdiales, Cantabria, 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 Castro‑Urdiales is currently classified as Good. The main pollutant identified is PM10, with a reference value of 3.0 µg/m³ reported from the available measurements.
Four valid observations were used to determine this assessment, and the data are 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 air‑quality dataset for Castro‑Urdiales contains a single monitoring station that reports five pollutants: nitrogen monoxide (NO), nitrogen dioxide (NO₂), ozone (O₃), particulate matter 10 µm or less (PM₁₀) and sulfur dioxide (SO₂). All measurements are expressed in micrograms per cubic metre. The most recent data point for NO dates back to 2024‑02‑04 23:00 UTC, while the other four pollutants have been updated more recently on 2026‑02‑09 15:00 UTC, indicating that the bulk of the current record is less than a week old.
Across the five compounds the recorded values are identical for each pollutant’s minimum, median and maximum, showing no observed variability in this limited sample. NO registers a constant 1.0 µg/m³, NO₂ stays at 4.0 µg/m³, O₃ is measured at 70.0 µg/m³, and both PM₁₀ and SO₂ are reported as 3.0 µg/m³. Because each pollutant has a single data point, the inter‑percentile spread (10th to 90th percentile) collapses to the same figure as the median, highlighting the narrow snapshot that the dataset provides.
The coverage is therefore very focused: one station contributes all rows, and only four of the five pollutants have been refreshed within the last seven days. The older NO entry, recorded more than two years ago, is the sole outlier in terms of freshness. Consequently, while the dataset gives a clear picture of what is being measured at this location, it does not capture temporal fluctuations or spatial differences that may exist elsewhere in Castro‑Urdiales. Users should keep in mind that air‑quality conditions can change throughout the day and across neighborhoods, and the current figures represent only the most recent single observations from one monitoring point.
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 Castro‑Urdiales is based on four valid measurements and was refreshed within the past three days, with the latest update recorded at 2026‑02‑09T15:00:00+00:00. This snapshot reflects conditions at a specific time and place; air quality can differ across neighborhoods and throughout the day, so values may not represent the entire city at any given moment.
OpenAQ station rows
| Station | Parameter | Value | Unit | Last updated |
|---|---|---|---|---|
| CASTRO URDIALES | no | 1.0 | µg/m³ | 2024-02-04 23:00 UTC |
| CASTRO URDIALES | no2 | 4.0 | µg/m³ | 2026-02-09 15:00 UTC |
| CASTRO URDIALES | o3 | 70.0 | µg/m³ | 2026-02-09 15:00 UTC |
| CASTRO URDIALES | pm10 | 3.0 | µg/m³ | 2026-02-09 15:00 UTC |
| CASTRO URDIALES | so2 | 3.0 | µg/m³ | 2026-02-09 15:00 UTC |