Air quality in Herznach-Ueken, Aargau, Switzerland today

Mr. Duck’s Air Quality Score

Good air today for Herznach-Ueken, Aargau, Switzerland

⚠️ 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 Herznach‑Ueken, Aargau is classified as Good today. The primary pollutant identified is PM2.5 (fine particles).

Measurements recorded by OpenAQ show a PM2.5 concentration of 5.31 µg/m³ based on ten valid observations. No PM10 reference value is available for this 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 Herznach‑Ueken air‑quality record draws from eleven data rows collected at two monitoring stations. Six pollutants are represented: PM1, PM2.5, PM10, relative humidity, temperature and particle count (UM003). The most recent measurements for five of these were recorded on 2026‑02‑10 22:00 UTC, while the PM10 value dates back to 2025‑01‑13 23:00 UTC, indicating that one pollutant relies on older data.

Across the recent set, PM1 values range from a low of 3.58 µg/m³ to a high of 318.15 µg/m³, with a median near 161 µg/m³ and the middle 80 % falling between roughly 35 µg/m³ (10th percentile) and 287 µg/m³ (90th percentile). PM2.5 shows a similar spread, from 5.31 µg/m³ up to 321.40 µg/m³, median 163 µg/m³, and the central bulk between about 37 µg/m³ and 290 µg/m³. Relative humidity varies between 63.9 % and 91.3 %, centering on a median of 77.6 %; temperature is confined to a narrow band from 7.5 °C to 10.73 °C, with a median of 9.11 °C. Particle concentration (UM003) spans 526 to 708.9 particles/cm³, median 617.45, and the bulk distribution lies between roughly 544 and 691 particles/cm³.

The data set is uneven: five pollutants have fresh entries from the last seven days, whereas PM10 relies on a single older record. Consequently, while the recent rows give a detailed picture of particulate matter, humidity, temperature and particle count, the older PM10 figure limits insight into that specific metric’s current behavior. Users should keep in mind that conditions can differ across locations within Herznach‑Ueken and over time, especially for pollutants with less up‑to‑date coverage.

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 Herznach-Ueken is based on ten valid measurements and was refreshed recently, having been updated within three days (last update 2026‑02‑10T22:00:00+00:00). This snapshot reflects conditions at the time of collection; air quality can differ across neighborhoods and change throughout the day, so values may not represent every location or moment in the city.

OpenAQ station rows