Air quality in Heerlen, Limburg, Netherlands today

Mr. Duck’s Air Quality Score

Good air today for Heerlen, Limburg, Netherlands

⚠️ 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 Heerlen today is classified as Good. The main pollutant identified is PM2.5 (fine particles). Measurements show a PM2.5 value of 1.38 µg/m³ and a PM10 value of 12.11 µg/m³, based on eight valid observations.

These figures are presented through OpenAQ 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 Heerlen in Limburg contains measurements for five pollutants – nitrogen monoxide (NO), nitrogen dioxide (NO₂), ozone (O₃), particulate matter 10 µm or less (PM₁₀) and particulate matter 2.5 µm or less (PM₂.₅). These values come from a total of nine recorded rows that are spread across two monitoring stations, all located at the Heerlen‑Jamboreepad site.

All entries were last refreshed on 2026-02-10 21:00 UTC, so the newest timestamps are uniformly recent for every pollutant. However, the depth of coverage differs: NO and NO₂ each have two rows, PM₁₀ and PM₂.₅ also have two rows, while O₃ is represented by a single row. The recorded concentrations show a modest spread. For NO the values range from 0.46 to 4.07 µg/m³ with a median of about 2.27 µg/m³; NO₂ varies between 10.37 and 18.17 µg/m³, centering around a median of 14.27 µg/m³. PM₁₀ spans from a negative minimum (‑0.69) up to 12.11 µg/m³, with the middle 80 % of observations lying between roughly 0.59 and 10.83 µg/m³; PM₂.₅ is tightly clustered between 0.29 and 1.38 µg/m³, medianing near 0.84 µg/m³. Ozone is reported at a single value of 58.56 µg/m³.

Because the dataset relies on only two stations, conditions can differ across other parts of Heerlen or change outside the moments captured here. The limited number of rows for some pollutants—especially ozone—means the picture is less complete than it would be with broader spatial coverage or more frequent updates. Nonetheless, the available data provide a recent snapshot of the city’s air quality across the key measured substances.

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 for Heerlen reflects eight valid measurements and is updated within 3 days, with the latest refresh recorded on 2026‑02‑10 at 21:00 UTC. This snapshot provides a current view of air quality across the city, but conditions can differ by specific neighbourhoods and times of day, so local variations may not be captured in these aggregate figures.

OpenAQ station rows