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

Mr. Duck’s Air Quality Score

Good air today for Cologne, 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 Cologne today is classified as Good. The primary pollutant identified is PM2.5 (fine particles). Measurements show a PM2.5 concentration of 7.07 µg/m³ and a PM10 level of 16.16 µg/m³, based on 24 valid observations.

Data is 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 OpenAQ feed for Cologne includes measurements of nitrogen monoxide (NO), nitrogen dioxide (NO2), ozone (O3), particulate matter of three size fractions (PM1, PM2.5 and PM10), relative humidity and temperature. In total the dataset contains 39 recent rows drawn from eight monitoring stations across the city.

The most up‑to‑date values were recorded on 2026-02-10 at 18:00 UTC for NO2, O3 and PM10, and at 19:00 UTC for PM1, PM2.5, relative humidity and temperature. The newest NO reading is older, last updated on 2024-03-11 at 11:00 UTC, so the nitrogen monoxide data are less current than the other pollutants. Across all parameters the median values cluster in a narrow band: PM10 averages about 16 µg/m³, PM2.5 around 7 µg/m³, NO roughly 6 µg/m³, NO2 close to 30 µg/m³, O3 near 24 µg/m³, while temperature hovers at 11.3 °C and relative humidity stays around 64 %. The spread between minimum and maximum is larger for the particulate matter and nitrogen oxides (e.g., PM10 ranges from about 7 to 55 µg/m³) than for ozone or the meteorological variables, which vary by only a few units.

Because some pollutants are reported from fewer stations – for example NO comes from six rows while O3 is available from just three – spatial coverage is uneven. Most of the data are fresh (within the last three days), but the older nitrogen monoxide record and the small number of ozone observations mean that city‑wide conditions can differ by location and time, especially for those less frequently sampled pollutants.

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 dataset for Cologne includes 24 valid measurements and is Updated within 3 days, with the most recent data recorded on 2026‑02‑10 at 19:00 UTC. These figures represent a snapshot of conditions across the city; air quality can differ by specific location and time of day, so individual experiences may vary from the reported values.

OpenAQ station rows