SmogRank / World / Europe / Switzerland / Thurgau

Most polluted cities in Thurgau, Switzerland

1 measured city, last 24 hours; 0 above the WHO 24-hour guideline. Worst: Kreuzlingen at 2.9 µg/m³, #1,386 in the world.

SchaffhausenThurgau: 1 measured cityZurich: 2 measured citiesSaint GallenAppenzell Ausserrhoden#1 Kreuzlingen: 2.9 µg/m³
Each dot is a measured city, coloured by its PM2.5; tap a dot to open the city.
  1. 1Kreuzlingen 160.2×
Good0–50
Moderate51–100
Sensitive groups101–150
Unhealthy151–200
Very unhealthy201–300
Hazardous301+

The US EPA's Air Quality Index for PM2.5 (2024 breakpoints). Show values as: µg/m³ · US AQI · India AQI · China AQI · European AQI · UK DAQI · Canada AQHI+. About the scales

Estimated: cities without a monitor

Thurgau cities we can't measure, with model estimates for the last 7 days. Listed by population, not ranked: estimates aren't precise enough to rank. Model estimates from the Copernicus Atmosphere Monitoring Service (CAMS), adjusted to measured cities nearby where there are any. Adjusted, a single day lands within ×1.5 of what a monitor would read about two times in three; unadjusted, it can be off by half or double. Treat them as a guide, not a measurement.

City7-day estimateBand
Frauenfeld≈ 12 µg/m³Moderate

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SmogRank, most polluted cities in Thurgau, Switzerland, PM2.5, last 24 hours to 2 Oct 2026, 23:00 UTC, smogrank.com/ch/region/thurgau.

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Updated 2026-10-02 23:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.