SmogRank / Countries / Japan / Nagano
Most polluted cities in Nagano, Japan
10 measured cities ranked by PM2.5, last 30 days. Worst: Iida at 4.7 µg/m³, #1917 in the world.
| # | City | µg/m³ | |
|---|---|---|---|
| 1 | Iida Nagano | 4.7 | |
| 2 | Nagano Nagano | 4.4 | |
| 3 | Suzaka Nagano | 4.3 | |
| 4 | Suwa Nagano | 4.2 | |
| 5 | Matsumoto Nagano | 4.2 | |
| 6 | Chikuma Nagano | 3.8 | |
| 7 | Okaya Nagano | 3.5 | |
| 8 | Ueda Nagano | 3.1 | |
| 9 | Ina Nagano | 3.1 | |
| 10 | Saku Nagano | 2.8 |
Good 0–9.0Moderate 9.1+Unhealthy for sensitive groups 35.5+Unhealthy 55.5+Very unhealthy 125.5+Hazardous 225.5+No data
Estimated: cities without a monitor
Nagano 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 |
|---|---|
| Azumino estimated | ≈ 5 µg/m³ |
| Shiojiri estimated | ≈ 4 µg/m³ |
| Chino estimated | ≈ 4 µg/m³ |
| Komoro estimated | ≈ 5 µg/m³ |
| Nakano estimated | ≈ 5 µg/m³ |
| Hotaka estimated | ≈ 5 µg/m³ |
| Komagane estimated | ≈ 4 µg/m³ |
| Tōmi estimated | ≈ 5 µg/m³ |
| Toyoshina estimated | ≈ 5 µg/m³ |
| Ōmachi estimated | ≈ 5 µg/m³ |
| Kamimaruko estimated | ≈ 5 µg/m³ |
| Kinoshita estimated | ≈ 4 µg/m³ |
| Iiyama estimated | ≈ 5 µg/m³ |
| Shimosuwa estimated | ≈ 4 µg/m³ |
| Karuizawa estimated | ≈ 5 µg/m³ |
| Tatsuno estimated | ≈ 4 µg/m³ |
| Minamiminowa estimated | ≈ 4 µg/m³ |
| Miyota estimated | ≈ 5 µg/m³ |
| Sakaki estimated | ≈ 5 µg/m³ |
Updated 2026-10-01 09:07 UTC. Values are PM2.5 in µg/m³ (fine particles), the median of each city's monitors.