Air quality in Collado Villalba, Community of Madrid, Spain today

Mr. Duck’s Air Quality Score

Good air today for Collado Villalba, Community of Madrid, 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 Collado Villalba is currently classified as Good. The primary pollutant measured is PM2.5, with a reported concentration of 1.0 µg/m³ based on eight valid observations collected via OpenAQ.

Overall conditions meet the Good category criteria, and the available data indicate that fine particulate levels are at the referenced value of 1.0 µg/m³. 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 Collado Villalba monitoring set contains five measured pollutants – nitrogen monoxide (NO), nitrogen dioxide (NO₂), ozone (O₃), fine particulate matter (PM2.5) and sulphur dioxide (SO₂). Data come from two stations, giving a total of fourteen recent rows; eight of those rows were recorded within the last seven days, while six are older than thirty days. The most up‑to‑date observations were captured on 2026‑02‑09 at 15:00 UTC for NO₂, O₃, PM2.5 and SO₂, whereas the latest NO reading dates back to 2024‑02‑28 at 23:00 UTC.

Across the recent data the concentration ranges are fairly wide for some gases and narrow for others. NO₂ shows a minimum of 10 µg/m³, a median of 13 µg/m³ and peaks at 73 µg/m³, with the 90th percentile near 61 µg/m³, indicating occasional high values alongside typical levels around the low‑teens. Ozone varies between 1 µg/m³ and 57 µg/m³, median 53 µg/m³, so most recent measurements sit close to the upper end of its range. PM2.5 is consistently low, ranging from 1 to 19 µg/m³ with a median of just 1 µg/m³; even the 90th percentile remains modest at about 15 µg/m³. SO₂ values are tightly clustered between 2 and 3 µg/m³, median 3 µg/m³, reflecting little fluctuation in recent records. NO is the only pollutant with older data; its recent range spans 1 to 2 µg/m³, median 1.5 µg/m³.

Overall, the dataset provides fresh information for four of the five pollutants, but coverage for NO is limited and dated. Because measurements come from just two stations, conditions can differ across neighborhoods and times not captured by these rows.

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 are based on eight valid measurements and have been refreshed recently, with the latest update recorded at 2026‑02‑09T15:00:00+00:00 (updated within three days). This snapshot reflects conditions captured across Collado Villalba in the Community of Madrid, but air quality can differ by specific location and time of day within the city.

OpenAQ station rows