SmogRank / Countries / Switzerland / Valais
Most polluted cities in Valais, Switzerland
0 measured cities, last 7 days.
No city has enough measurements for this window yet.
Good0–9.0
Moderate9.1–35.4
Sensitive groups35.5–55.4
Unhealthy55.5–125.4
Very unhealthy125.5–225.4
Hazardous225.5+
Estimated: cities without a monitor
Valais 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.
| City | 7-day estimate |
|---|---|
| Sitten | ≈ 5 µg/m³ |
| Martigny-Ville | ≈ 6 µg/m³ |
| Monthey | ≈ 8 µg/m³ |
| Sierre | ≈ 4 µg/m³ |
Updated 2026-10-01 21:07 UTC. Values are PM2.5 in µg/m³ (fine particles), the median of each city's monitors.