SmogRank / World / Switzerland / February 2025

Most unhealthy days in Switzerland, February 2025

8 cities in Switzerland ranked by their share of unhealthy days over the 28 days. The most unhealthy days: Giubiasco, Switzerland, 6 of 21 measured days. A city needs measurements on 70% of the days to be ranked.

Ranked by unhealthy days: the share of each city's measured days with a daily mean over 35.4 µg/m³ (US AQI 101+), Unhealthy for Sensitive Groups or worse on the US EPA's scale. Ties go to the higher average.

← Giubiasco 29% 20%0
Every city in Switzerland ranked for February 2025, one column each, ranked by unhealthy days: height is the share of its measured days that were unhealthy, colour its average. Point at it to read a city; tap to open it.
  1. 1GiubiascoTicino
    6 of 21
  2. 2KreuzlingenThurgau
    3 of 22
  3. 3PayerneVaud
    0 of 21
  4. 4BaselBasel-City
    0 of 24
  5. 5BernBern
    0 of 22
  6. 6ZürichZurich
    0 of 21
  7. 7LuganoTicino
    0 of 21
  8. 8KüssnachtSchwyz
    0 of 21
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

All cities in the world, February 2025 · Switzerland now

Regions

Basel-City 1Bern 1Schwyz 1Thurgau 1Ticino 2Vaud 1Zurich 1

Ranked cities in each region, February 2025.

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SmogRank, most polluted cities in Switzerland, by unhealthy days, PM2.5, February 2025, smogrank.com/ch/history/2025-02?by=days (accessed 10 Oct 2026). Some readings from Uzhydromet (Uzbekistan's Hydrometeorological Service); Department of Environment, Nepal; Vietnam's government monitors; Aurassure; Umhverfisstofnun (Environment Agency of Iceland); RMCAB (Secretaría Distrital de Ambiente, Bogotá); Love My Air (City and County of Denver), no reuse terms published.

Download top 10 by average (PNG)

You're welcome to reuse a single chart, image or figure with this citation and a link. Terms. Raw monitor readings in bulk are published by OpenAQ, under each provider's licence.