Air quality in Bonn, North Rhine-Westphalia, Germany today

Mr. Duck’s Air Quality Score

Good air today for Bonn, North Rhine-Westphalia, Germany

⚠️ 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 Bonn today is classified as Good. The primary pollutant identified is PM2.5 (fine particles). Measurements show a PM2.5 value of 3.718 µg/m³ and a PM10 value of 6.43 µg/m³, based on eight valid observations.

Data are shown via OpenAQ. 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 Bonn includes eight measured pollutants: nitrogen monoxide (NO), nitrogen dioxide (NO₂), particulate matter 1 µm (PM₁), PM₂.₅, PM₁₀, relative humidity, temperature and particle count (UM003). Data come from two monitoring stations, giving a total of nine rows of observations.

Freshness varies across the series. The most recent values were recorded on 2026‑02‑10 17:00 UTC for PM₂.5, NO₂, PM₁₀ and on 2026‑02‑08 14:00 UTC for PM₁, relative humidity, temperature and UM003, meaning those six pollutants have updates within the last three to seven days. The NO measurement is older, last updated on 2024‑03‑11 11:00 UTC, so its information reflects conditions from almost two years ago.

Across the available data the range of values differs markedly. PM₂.5 spans from a low of 3.718 µg/m³ to a high of 10.411 µg/m³, with a median of about 7.06 µg/m³, indicating modest variability in fine particulate levels at the Auerberg site. In contrast, PM₁ is reported as a single value of 6.6748 µg/m³ and UM003 as exactly 1 126.5 particles/cm³, showing no observed spread for those parameters. Relative humidity and temperature are also single‑point records (58.66 % and 11.15 °C respectively), reflecting the limited temporal depth of the dataset.

Overall, while most pollutants have recent measurements, coverage is uneven: NO is outdated, and several variables provide only one observation per station. Consequently, city‑wide conditions may differ by location and time, and the current data give a snapshot rather than a continuous picture of air quality in Bonn.

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 eight valid measurements and have been refreshed recently, with the latest update recorded on 2026‑02‑10 at 17:00 UTC; the dataset is considered “Updated within 3 days.” This snapshot reflects conditions measured at specific monitoring points and times, so air quality can differ across neighbourhoods and moments throughout Bonn.

OpenAQ station rows