Air quality in Maarssen, Utrecht, Netherlands today

Mr. Duck’s Air Quality Score

Moderate air today for Maarssen, Utrecht, 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 Maarssen today is classified as Moderate. The primary pollutant identified is PM2.5 (fine particles), with a measured concentration of 25.13 µg/m³ based on five valid observations.

Data is shown via OpenAQ and reflects the current assessment for this location. 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 Maarssen contains measurements from a single monitoring location that records six different variables: fine particles (PM1), coarse particles (PM10), fine‑particle mass (PM2.5), relative humidity, temperature and particle count (UM003). In total there are six rows of data, each representing the most recent reading for one of these pollutants.

The freshest observations were all taken on 2026-02-10 at 22:00 UTC for PM1, PM2.5, relative humidity, temperature and UM003, showing that the sensor feed is being updated within the last week for the majority of parameters. The PM10 value is older, recorded on 2025-01-13 at 23:00 UTC, so information on coarse particles reflects conditions from more than a year ago. Across the dataset every pollutant has exactly one reported value, with no range or variability shown; each metric reports the same minimum, median and maximum figure.

Because only one station supplies data, the numbers represent conditions at that specific site – Creative HUB Niftarlake College – rather than city‑wide averages. The PM1 concentration stands at 12.44 µg/m³, PM2.5 at 25.13 µg/m³ and PM10 at 66.37 µg/m³. Relative humidity is measured at 60.67 % and temperature at 13.94 °C, while the particle counter registers 794.39 particles per cubic centimetre. The uniformity of the reported values (single‑point snapshots) means there is no observed spread or trend within this dataset; any variation in air quality across different neighbourhoods or times of day cannot be captured here. Users should keep in mind that conditions may differ elsewhere in Maarssen and that the older PM10 reading does not reflect current coarse‑particle levels.

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 Maarssen reflects five valid measurements and was refreshed recently, with the latest update recorded on 2026‑02‑10 at 22:00 UTC; it is therefore considered “Updated within 3 days.” While this snapshot provides a reliable overview of current conditions, air quality can differ across neighbourhoods and change throughout the day, so local variations may exist.

OpenAQ station rows