Air quality in Hernani, Autonomous Community of the Basque Country, Spain today
Mr. Duck’s Air Quality Score
Good air today for Hernani, Autonomous Community of the Basque Country, 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 Hernani today is classified as Good. The main pollutant identified is PM2.5, which consists of fine particulate matter. Reference concentrations are 3.0 µg/m³ for PM2.5 and 8.0 µg/m³ for PM10, the latter representing coarse particles. Four valid measurements support this assessment, providing the latest snapshot of particulate levels in the city. Both values are expressed in micrograms per cubic meter, the standard unit for airborne particle concentration.
These figures are presented through OpenAQ, which aggregates publicly available monitoring data. The reported numbers represent the most recent observations collected for Hernani. The dataset is updated whenever new sensor readings become available, ensuring that the information remains current. 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 Hernani includes measurements of nitrogen dioxide (NO2), particulate matter ≤ 10 µm (PM10), particulate matter ≤ 2.5 µm (PM2.5) and sulfur dioxide (SO2). All values come from a single monitoring station, giving a total of six data rows. Four of those rows have been updated within the last 30 days, while the remaining two are older than a month; none are from today or the past week. The most recent timestamp across the pollutants is 2026‑02‑09 15:00 UTC for PM10, PM2.5 and SO2, whereas the latest NO2 reading dates back to 2026‑01‑28 13:00 UTC.
NO2 shows the widest numerical spread, ranging from a minimum of 11 µg/m³ to a maximum of 20 µg/m³ with a median of 15.5 µg/m³, indicating noticeable variability in the limited sample set. In contrast, PM10, PM2.5 and SO2 each have a single recorded value—8 µg/m³, 3 µg/m³ and 2 µg/m³ respectively—so no intra‑pollutant variation can be observed for those compounds. Because the data originate from only one site, the figures represent conditions at that specific location and may not capture differences across other parts of the city. The overall freshness is moderate: the newest measurements are about two weeks old, and the older NO2 entry is roughly three weeks old, meaning the current snapshot does not reflect real‑time air quality but provides a recent, though limited, picture of Hernani’s atmospheric composition.
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 for Hernani includes four valid measurements and is updated within 30 days. The latest update occurred on 2026-02-09T15:00:00+00:00. Please note that air quality can vary by location and time within the city, so this snapshot reflects the conditions at the time of measurement.
OpenAQ station rows
| Station | Parameter | Value | Unit | Last updated |
|---|---|---|---|---|
| HERNANI | no2 | 11.0 | µg/m³ | 2017-07-20 09:00 UTC |
| HERNANI | pm10 | 8.0 | µg/m³ | 2017-07-20 09:00 UTC |
| HERNANI | no2 | 20.0 | µg/m³ | 2026-01-28 13:00 UTC |
| HERNANI | pm10 | 8.0 | µg/m³ | 2026-02-09 15:00 UTC |
| HERNANI | pm25 | 3.0 | µg/m³ | 2026-02-09 15:00 UTC |
| HERNANI | so2 | 2.0 | µg/m³ | 2026-02-09 15:00 UTC |