What is the air quality in Chiayi City?

Chiayi City, Taiwan has an annual US AQI of 90 (Polluted) and average PM2.5 of 29.2 µg/m³, ranking #4251 of 5856 cities. Main pollutant: PM2.5.

What is the cleanest month in Chiayi City?

June is typically the cleanest month (AQI 55) and March the most polluted (AQI 113).

Where does Chiayi City's air quality data come from?

PM2.5: 1998–2026 (monitors 2004–2026, satellite 1998–2004; 2026 provisional). Measured by government monitoring stations. Full sources are on the methodology page.

Chiayi City, Taiwan — Air Quality & Clean City Guide 2026

Chiayi City Air Quality Data

Global rank	City	Continent	AQI	PM2.5
4251	Chiayi City, Taiwan	Asia	AQI 90	PM2.5 29.2 µg/m³