What is the air quality in Niiza?

Niiza, Japan has an annual US AQI of 61 (Polluted) and average PM2.5 of 14.4 µg/m³, ranking #2228 of 5856 cities. Main pollutant: PM2.5.

What is the cleanest month in Niiza?

January is typically the cleanest month (AQI 58) and May the most polluted (AQI 66).

Where does Niiza's air quality data come from?

PM2.5: 1998–2025 (monitors 2018–2025, satellite 1998–2018, 2022; 2025 provisional). Measured by government monitoring stations. Full sources are on the methodology page.

Niiza, Japan — Air Quality & Clean City Guide 2026

Niiza Air Quality Data

Global rank	City	Continent	AQI	PM2.5
2228	Niiza, Japan	Asia	AQI 61	PM2.5 14.4 µg/m³