Air quality in Bielefeld, North Rhine-Westphalia, Germany today
Mr. Duck’s Air Quality Score
Moderate air today for Bielefeld, North Rhine-Westphalia, Germany
This friendly indicator summarizes the latest city readings. For health guidance, please see: EPA AirNow or WHO.
Air quality today
The air quality in Bielefeld today falls into the Moderate category according to OpenAQ data. The primary pollutant identified is PM2.5 (fine particles). Measurements show a PM2.5 concentration of 12.953 µg/m³ and a PM10 level of 20.079 µg/m³, based on seven valid observations.
These values reflect the current state of ambient air in the city without implying any trend or cause. 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 Bielefeld includes measurements of nitrogen monoxide (NO), nitrogen dioxide (NO₂), ozone (O₃), particulate matter ≤ 10 µm (PM10) and particulate matter ≤ 2.5 µm (PM2.5). Across the city there are nine data rows coming from two monitoring stations, all located at the Bielefeld‑Ost site. The timestamps show a mixed picture of freshness: the NO reading is from 2024‑03‑11 11:00 UTC, while the latest updates for NO₂, PM10, PM2.5 and O₃ are all from 2026‑02‑10 17:00 UTC, indicating that most pollutants have been recorded within the last three days but the NO data is considerably older.
The values illustrate a modest spread for each pollutant. NO ranges from 3.825 to 10.705 µg/m³ with a median of about 7.27 µg/m³; NO₂ varies between 18.078 and 23.039 µg/m³, centred around a median of 20.56 µg/m³. PM10 shows a minimum of 13.744 µg/m³ and a maximum of 20.079 µg/m³, with a typical value near 16.91 µg/m³, while PM2.5 is tightly clustered between 10.901 and 12.953 µg/m³, median 11.93 µg/m³. Ozone has a single reported figure of 36.143 µg/m³, reflecting only one observation at the time of download.
Because the data come from just two stations in the eastern part of the city, they capture conditions at that location but may not represent variations elsewhere in Bielefeld. The older NO record and the uniformity of the O₃ entry highlight gaps in temporal coverage for some pollutants, so readers should keep in mind that air quality can differ by neighbourhood and over time.
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 seven valid measurements and were refreshed recently, with the latest update recorded at 2026‑02‑10 17:00 UTC (updated within three days). This snapshot reflects conditions measured at specific monitoring points and times; air quality can differ across neighborhoods and throughout the day in Bielefeld, North Rhine‑Westphalia.
OpenAQ station rows
| Station | Parameter | Value | Unit | Last updated |
|---|---|---|---|---|
| Bielefeld-Ost | no | 3.825 | µg/m³ | 2024-03-11 11:00 UTC |
| Bielefeld-Ost | no2 | 18.078 | µg/m³ | 2026-02-10 17:00 UTC |
| Bielefeld-Ost | o3 | 36.143 | µg/m³ | 2026-02-10 17:00 UTC |
| Bielefeld-Ost | pm10 | 13.744 | µg/m³ | 2026-02-10 17:00 UTC |
| Bielefeld-Ost | pm25 | 10.901 | µg/m³ | 2026-02-10 17:00 UTC |
| Bielefeld Detmolder Straße | no | 10.705 | µg/m³ | 2024-03-11 11:00 UTC |
| Bielefeld Detmolder Straße | no2 | 23.039 | µg/m³ | 2026-02-10 17:00 UTC |
| Bielefeld Detmolder Straße | pm10 | 20.079 | µg/m³ | 2026-02-10 17:00 UTC |
| Bielefeld Detmolder Straße | pm25 | 12.953 | µg/m³ | 2026-02-10 17:00 UTC |