Air quality in Guadalix de la Sierra, Community of Madrid, Spain today

Mr. Duck’s Air Quality Score

Good air today for Guadalix de la Sierra, 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 Guadalix de la Sierra is classified as Good today. The primary pollutant identified is PM10, the coarser particulate matter measured by local monitoring stations. Six valid measurements were recorded for this assessment.

The reference value for PM10 is 2.0 µg/m³, providing a benchmark for comparison with observed concentrations. 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 Guadalix de la Sierra includes four measured pollutants – nitrogen monoxide (NO), nitrogen dioxide (NO₂), ozone (O₃) and particulate matter ≤ 10 µm (PM10). The information comes from two monitoring stations that together contribute eleven rows of data. For three of the pollutants (NO₂, O₃ and PM10) the most recent readings were recorded on 2026‑02‑09 at 15:00 UTC, so those values are up to date within the last seven days. In contrast, the NO measurement is older, with its latest entry dated 2024‑02‑28 at 23:00 UTC, and therefore reflects conditions from more than a year ago.

The recorded concentrations show a modest spread for each pollutant that is captured in the summary statistics. NO₂ values range from a minimum of 7 µg/m³ to a maximum of 30 µg/m³, with a median of 7 µg/m³ and the 90th percentile at 25.4 µg/m³, indicating most recent observations cluster near the lower end of the observed range. O₃ displays a narrower distribution: the minimum is 9 µg/m³, the maximum and median are both 54 µg/m³, and the 10th percentile already sits at 18 µg/m³, suggesting that recent measurements have been consistently high. PM10 shows the greatest variability, from 2 µg/m³ up to 33 µg/m³, with a median of 2 µg/m³ and a 90th‑percentile value of 26.8 µg/m³, meaning occasional spikes are recorded alongside generally low background levels. NO is reported as a single constant value of 2 µg/m³ across its limited, older data set.

Overall the coverage is uneven: three pollutants have fresh, multi‑day data while NO relies on an outdated entry, and the number of rows (eleven) reflects relatively sparse sampling for the city. Consequently, the snapshot provides a useful but limited picture of current air quality, and conditions can differ across locations and times not captured by these measurements.

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 Guadalix de la Sierra currently includes six valid measurements and is updated within three days, with the latest values recorded on 9 February 2026 at 15:00 UTC. These figures represent a snapshot of ambient conditions; air quality can differ across neighborhoods and change throughout the day, so individual experiences may vary from the reported averages.

OpenAQ station rows