Air quality in San Martín de Valdeiglesias, Community of Madrid, Spain today

Mr. Duck’s Air Quality Score

Good air today for San Martín de Valdeiglesias, 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 San Martín de Valdeiglesias is classified as Good today. The main pollutant identified is PM10, and the measured value aligns with a reference level of 1.0 for this particle size.

Data from six valid measurements are shown via OpenAQ, confirming that the current conditions meet the Good category criteria. 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 record for San Martín de Valdeiglesias contains data from two monitoring stations and a total of eleven individual rows. Four pollutants are reported: nitrogen monoxide (NO), nitrogen dioxide (NO₂), ozone (O₃) and particulate matter up to 10 µm (PM₁₀). The most recent measurements for NO₂, O₃ and PM₁₀ were all taken on 2026‑02‑09 at 15:00 UTC, so those three series are current within the last week. In contrast, the latest NO value dates back to 2024‑02‑28 at 23:00 UTC, which means that nitrogen monoxide data are considerably older.

Across the recent dataset, NO₂ values range from a low of 2 µg/m³ to a high of 27 µg/m³, with a median of 3 µg/m³ and the central 80 % of observations falling between roughly 2.2 and 22.2 µg/m³. Ozone shows a broader spread, moving from 31 µg/m³ up to 60 µg/m³; the typical (median) level is 57 µg/m³ and most readings sit between about 36 and 59 µg/m³. PM₁₀ concentrations are very low overall, varying only between 1 and 34 µg/m³, with a median of 1 µg/m³ and the bulk of values (10th‑90th percentile) from 1 to 27.4 µg/m³. NO measurements are limited to three recent rows, ranging from 1 to 3 µg/m³, with a median of 2 µg/m³ and most values between roughly 1.2 and 2.8 µg/m³.

Because the dataset includes only two stations, spatial coverage is modest and conditions can differ across neighborhoods or at times not captured by the latest timestamps. The freshness gap for NO highlights that some pollutant streams are less up‑to‑date than others, so a full picture of current air quality relies mainly on the recent NO₂, O₃ and PM₁₀ readings.

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 six valid measurements and were refreshed recently, being Updated within 3 days; the latest set was recorded at 2026‑02‑09T15:00:00+00:00. This snapshot reflects conditions at that time but air quality can differ across neighborhoods and change throughout the day, so values may not represent every location or moment in San Martín de Valdeiglesias.

OpenAQ station rows