Air quality in Zalla, Autonomous Community of the Basque Country, Spain today

Mr. Duck’s Air Quality Score

Good air today for Zalla, Autonomous Community of the Basque Country, Spain

⚠️ This website is currently under active development. Some data may be incomplete or temporarily inaccurate. For health-critical decisions, please verify information through official government or environmental sources.

Categories follow US EPA AQI breakpoints for PM (estimate from latest valid measurements; this project does not compute EPA NowCast/24-hour AQI yet).

This friendly indicator summarizes the latest city readings. For health guidance, please see: EPA AirNow or WHO.

Air quality today

The air quality in Zalla today is classified as Good. The main pollutant identified is PM2.5. Current observations report PM2.5 at 2.0 µg/m³ and PM10 at 6.0 µg/m³.

These values are based on five valid measurements collected and displayed through OpenAQ. The data reflect the conditions measured during the reporting period. The dataset includes multiple sampling points across the city, providing a representative snapshot of ambient air. All reported values fall within the reference thresholds for the region. 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 Zalla air‑quality record contains measurements for six pollutants – nitrogen monoxide (NO), nitrogen dioxide (NO2), ozone (O3), particulate matter 10 µm (PM10), particulate matter 2.5 µm (PM2.5) and sulphur dioxide (SO2). The data come from two monitoring stations and comprise eleven individual rows. Five of those rows have been updated within the last thirty days, while the remaining six are classified as old; the most recent timestamps are 2026‑02‑09 15:00 UTC for O3, PM10, PM2.5 and SO2, and 2026‑01‑28 13:00 UTC for NO2. The lone NO observation dates back to 2024‑01‑16 23:00 UTC and originates from a different site (ES1598A).

Across the recent data the observed concentrations show a modest spread. NO2 values range from 4.0 µg/m³ up to 11.0 µg/m³, with a median of 7.5 µg/m³ and the 10th‑percentile at 4.7 µg/m³, indicating most recent readings cluster in the lower half of the range. Ozone varies between 46.0 and 60.0 µg/m³, median 53.0 µg/m³, with the 90th‑percentile reaching 58.6 µg/m³, suggesting a relatively narrow upper band. PM10 spans 6.0 to 21.0 µg/m³, median 13.5 µg/m³, while PM2.5 covers 2.0 to 13.0 µg/m³, median also 7.5 µg/m³; both particulate series show a broader spread between their 10th‑ and 90th‑percentiles. SO2 is recorded between 3.0 and 6.0 µg/m³, median 4.5 µg/m³, with the upper 90th‑percentile at 5.7 µg/m³. In contrast, NO has only a single historic value of 0.0 µg/m³, offering no recent insight for that pollutant. Overall, the dataset provides recent coverage for five of the six pollutants, but the presence of older rows and the limited station count mean that conditions can differ across the city and over time.

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

These data are based on five valid measurements and were updated within 30 days, with the latest reading recorded on 2026-02-09 at 15:00 UTC. The values reflect conditions at the time of sampling and are presented as a snapshot; air quality can vary by location and time within the city of Zalla, Autonomous Community of the Basque Country, Spain.

OpenAQ station rows