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

Mr. Duck’s Air Quality Score

Good air today for Aachen, 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 Aachen today is classified as Good. The main pollutant identified is PM2.5 (fine particles). Measurements show a PM2.5 reference value of 0.0 and a PM10 reference value of 2.98, based on eleven valid observations collected via OpenAQ.

Overall conditions meet the criteria for the Good category according to the current assessment. 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 Aachen contains eight measured variables: nitrogen monoxide (NO), nitrogen dioxide (NO₂), ozone (O₃), particulate matter of 10 µm (PM₁₀), 2.5 µm (PM₂.₅) and 1 µm (PM₁) size fractions, relative humidity and temperature. Altogether four sensor rows contribute to the record, with each row representing a distinct monitoring site.

The most recent observations are from early February 2026: NO₂ was last updated on 2026‑02‑10 at 17:00 UTC in Wilhelmstraße, O₃ and PM₁₀ on 2026‑02‑10 at 18:00 UTC in Burtscheid, and PM₂.₅, PM₁, humidity and temperature on 2026‑02‑10 at 19:00 UTC in Walheim. The NO reading is older, dated 2024‑03‑11 at 11:00 UTC in Wilhelmstraße. Across the pollutants, three‑quarter of the values are from the last few days, while one value (NO) is more than a year old.

The range of concentrations varies widely among gases and particles. NO spans from 0.243 µg/m³ up to 23.761 µg/m³, with a median near 1.1 µg/m³; NO₂ shows a tighter spread between 5.8 and 29.05 µg/m³, median 11.16 µg/m³. Ozone values are clustered between 45.5 and 51.4 µg/m³, median 48.45 µg/m³. Particulate matter is low: PM₁₀ ranges from 2.98 to 12.29 µg/m³ (median 10.60 µg/m³), while both PM₂.₅ and PM₁ are recorded as zero at the Walheim site. Humidity and temperature each have a single reported value, 58.70 % and 12.48 °C respectively.

Because only four stations contribute data and some pollutants (notably PM₁ and PM₂.₅) show a single measurement of zero, the picture of air quality in Aachen is limited to these points in time and space. Conditions can differ across neighborhoods and over hours that are not captured by the current dataset.

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 Aachen reflects 11 valid measurements and is refreshed regularly, having been updated within 3 days (last update: 2026‑02‑10T19:00:00+00:00). This snapshot provides a current view of city‑wide air quality, but conditions can differ across neighborhoods and change throughout the day. Consequently, values may not represent every location or moment in Aachen at any given time.

OpenAQ station rows