Air quality in Halfweg, North Holland, Netherlands today
Mr. Duck’s Air Quality Score
Moderate air today for Halfweg, North Holland, Netherlands
This friendly indicator summarizes the latest city readings. For health guidance, please see: EPA AirNow or WHO.
Air quality today
The air quality in Halfweg today is classified as Moderate. The primary pollutant identified is PM2.5 (fine particles).
Measurements from three valid monitoring stations show a PM2.5 reference value of 11.4 µg/m³ and a PM10 reference value of 13.9 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
Halfweg’s air‑quality feed draws from seven monitoring rows, each reporting a single pollutant at the Amsterdam‑Spaarnwoude site. The dataset currently includes nitrogen dioxide (NO₂), particulate matter up to 10 µm (PM₁₀), fine particulate matter up to 2.5 µm (PM₂.₅) and nitric oxide (NO). For NO₂, PM₁₀ and PM₂.₅ the most recent reading was logged on 2026‑02‑10 at 21:00 UTC, so these three pollutants have fresh data that were updated within the past week. In contrast, the only NO record dates back to 2024‑03‑25 at 22:00 UTC and is flagged as old; its values are placeholder –999.0 µg/m³, indicating no usable measurement.
The recent measurements show a modest spread. NO₂ ranged from a low of 6.6 µg/m³ to a high of 29.2 µg/m³, with a median around 17.9 µg/m³ and the central 80 % of values falling between roughly 8.9 and 26.9 µg/m³. PM₁₀ values were tightly clustered, varying only from 11.8 to 13.9 µg/m³; the median is 12.85 µg/m³ and the 10th–90th percentile band spans about 12.0 to 13.7 µg/m³. PM₂.₅ exhibited a broader range, from 4.4 up to 11.4 µg/m³, with a median of 7.9 µg/m³ and the middle 80 % between roughly 5.1 and 10.7 µg/m³. Because NO lacks recent or valid data, its presence in the dataset does not contribute useful information about current conditions.
Overall, Halfweg’s air‑quality picture is built on a small number of rows that provide up‑to‑date readings for three key pollutants, while the fourth (NO) remains outdated and non‑informative. Users should keep in mind that these values reflect only one monitoring location and capture a snapshot from early February 2026; conditions elsewhere in the city or at other times may differ.
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 Halfweg reflects three valid measurements and was refreshed recently, with the latest update recorded on 2026‑02‑10 at 21:00 UTC; it is labelled as Updated within 3 days. While these figures give a reliable snapshot of current conditions, air quality can differ across neighbourhoods and change throughout the day, so local variations may not be captured in this summary.
OpenAQ station rows
| Station | Parameter | Value | Unit | Last updated |
|---|---|---|---|---|
| Amsterdam-Spaarnwoude | no2 | 6.6 | µg/m³ | 2025-09-04 13:00 UTC |
| Amsterdam-Spaarnwoude | pm10 | 11.8 | µg/m³ | 2025-09-04 12:00 UTC |
| Amsterdam-Spaarnwoude | pm25 | 4.4 | µg/m³ | 2025-09-04 13:00 UTC |
| Amsterdam-Spaarnwoude | no2 | 29.2 | µg/m³ | 2026-02-10 21:00 UTC |
| Amsterdam-Spaarnwoude | pm10 | 13.9 | µg/m³ | 2026-02-10 21:00 UTC |
| Amsterdam-Spaarnwoude | pm25 | 11.4 | µg/m³ | 2026-02-10 21:00 UTC |