Air quality in St. Gallen, St. Gallen, Switzerland today

Mr. Duck’s Air Quality Score

Good air today for St. Gallen, St. Gallen, 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 St. Gallen is classified as Good today. The primary pollutant measured is PM10.

According to the latest data shown via OpenAQ, the PM10 concentration reference value is 8.0557 and twelve valid measurements were recorded 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 St. Gallen air‑quality dataset currently contains three measured pollutants – nitrogen dioxide (NO2), ozone (O3) and particulate matter up to 10 µm (PM10). All values come from five sensor rows, each with three separate readings, giving a total of fifteen individual measurements across the city. The most recent update for every pollutant was recorded on 2026‑02‑10 at 21:00 UTC, so the data are all fresh within the last seven days.

For NO2 the observed concentrations range from a low of 1.27 µg/m³ to a high of 42.83 µg/m³, with a median value of about 2.68 µg/m³ and the 10th‑percentile at 1.31 µg/m³. Ozone shows a much tighter spread: values start at 12.72 µg/m³, peak at 87.06 µg/m³, and cluster around a median of 79.25 µg/m³; the 10th‑percentile is 15.96 µg/m³ while the 90th‑percentile reaches 86.16 µg/m³. PM10 measurements are comparatively low, varying between 1.14 and 8.06 µg/m³, with a median of 2.68 µg/m³ and a 10th‑percentile of 1.47 µg/m³.

The dataset is evenly balanced across the three pollutants – each has five reporting stations and all share the same last‑updated timestamp, indicating consistent coverage rather than gaps for any single compound. However, the range between minimum and maximum values differs markedly: ozone exhibits a broad high‑end tail, whereas PM10 stays within a narrow band. Because the data reflect only the specific locations of the five stations, conditions elsewhere in St. Gallen may differ, especially at times outside the most recent update.

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 St. Gallen currently includes twelve valid measurements and is marked as Updated within 3 days, with the latest values recorded on 2026‑02‑10 at 21:00 UTC. These figures represent a snapshot of conditions across the city; air quality can differ by specific neighbourhoods and change throughout the day, so local variations may not be captured in this summary.

OpenAQ station rows