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

Mr. Duck’s Air Quality Score

Moderate air today for Tolosa, 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 today in Tolosa is classified as Moderate. The primary pollutant identified in the measurement set is PM2.5. Six valid observations were recorded and used to determine the category. Concentrations are reported in micrograms per cubic meter. The assessment reflects the balance of the measured values against established reference thresholds.

The reference value for PM2.5 is 10.0 µg/m³, and the reference value for PM10 is 21.0 µg/m³. Data is shown via OpenAQ. The six valid measurements form the basis of the current evaluation. Only reference values for PM2.5 and PM10 are included in the displayed data. 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 Tolosa includes measurements of nitrogen dioxide (NO2), particulate matter up to 10 µm (PM10), particulate matter up to 2.5 µm (PM2.5) and nitric oxide (NO). All values are reported in micrograms per cubic metre. The information comes from two monitoring stations that together contributed nine recent rows of data. Six of those rows have been updated within the last 30 days, while three rows are classified as older. The most recent timestamps are 2026‑02‑09 15:00 UTC for both PM10 and PM2.5, and 2026‑01‑28 13:00 UTC for NO2. The NO measurement is older, last recorded on 2024‑01‑16 23:00 UTC, which means that the nitrogen‑oxide data reflects conditions from more than two years ago.

Across the recent records, NO2 values range from 32 µg/m³ to 40 µg/m³, with a median of 32 µg/m³ and a 90th‑percentile of 38.4 µg/m³, indicating a relatively narrow spread around the lower end of the observed range. PM10 shows a broader distribution, varying between 15 µg/m³ and 31 µg/m³; the median sits at 21 µg/m³, while the 10th‑percentile is 16.2 µg/m³ and the 90th‑percentile reaches 29 µg/m³. PM2.5 values are clustered between 6 µg/m³ and 10 µg/m³, with a median of 8 µg/m³ and percentiles of 6.4 µg/m³ (10th) and 9.6 µg/m³ (90th). The NO reading is a single value of 1 µg/m³, reflecting the limited and dated coverage for this pollutant.

These figures illustrate that Tolosa’s current air‑quality snapshot is most complete for particulate matter, with recent and multiple observations, while the nitrogen‑oxide component is less current and less detailed. Consequently, the overall picture may not capture short‑term variations in NO, and conditions can differ across the city depending on location and 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

The dataset for Tolosa includes six valid measurements and is updated within 30 days. The latest data were recorded on 2026-02-09 at 15:00 UTC. Air quality can vary by location and time within the city, so this snapshot may not reflect conditions everywhere or at other moments.

OpenAQ station rows