What is the air quality in Nagano?

Nagano, Japan has an annual US AQI of 54 (Reasonable) and average PM2.5 of 11.4 µg/m³, ranking #1208 of 5856 cities. Main pollutant: PM2.5.

What is the cleanest month in Nagano?

December is typically the cleanest month (AQI 45) and May the most polluted (AQI 66).

Where does Nagano's air quality data come from?

PM2.5: 1998–2026 (monitors 2010–2026, satellite 1998–2010; 2025–2026 provisional). Measured by government monitoring stations. Full sources are on the methodology page.

Nagano, Japan — Air Quality & Clean City Guide 2026

Nagano Air Quality Data

Global rank	City	Continent	AQI	PM2.5
1208	Nagano, Japan	Asia	AQI 54	PM2.5 11.4 µg/m³