SmogRank / Cleaner or dirtier / Switzerland
Switzerland: cleaner or dirtier, 2026
In Switzerland, 10 cities have enough days in both years to compare 2026 so far (1 January to 6 October) with the same days of 2025: 4 got dirtier and 6 cleaner.
The 4 cities that got dirtier, biggest rise first
| # | City | 2025 | 2026 | Change |
|---|---|---|---|---|
| 1 | LuganoTicino, Switzerland | 44 | 52 | +1.8 µg/m³+23% |
| 2 | GiubiascoTicino, Switzerland | 53 | 55 | +1.4 µg/m³+14% |
| 3 | BellinzonaTicino, Switzerland | 53 | 55 | +1.4 µg/m³+14% |
| 4 | KüssnachtSchwyz, Switzerland | 25 | 26 | +0.2 µg/m³+4% |
The 6 cities that got cleaner, biggest fall first
| # | City | 2025 | 2026 | Change |
|---|---|---|---|---|
| 1 | WinterthurZurich, Switzerland | 61 | 48 | −6.0 µg/m³−41% |
| 2 | PayerneVaud, Switzerland | 47 | 42 | −0.9 µg/m³−11% |
| 3 | BaselBasel-City, Switzerland | 51 | 47 | −0.8 µg/m³−9% |
| 4 | BernSwitzerland | 52 | 49 | −0.8 µg/m³−8% |
| 5 | ZürichZurich, Switzerland | 50 | 49 | −0.1 µg/m³−1% |
| 6 | KreuzlingenThurgau, Switzerland | 52 | 51 | −0.1 µg/m³−1% |
Means in US AQI over the days a city was measured in both years, the same calendar days each year; a city needs 55% of the days paired, and at least 30. The change is in µg/m³ and per cent. How we compare.
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
Updated 2026-10-07 12:07 UTC. Values are PM2.5 (fine particles), the median of each city's monitors, as the US AQI PM2.5 sub-index.