Air Quality Lab — Chiayi City, Taiwan
Air Quality Profile·
Chiayi City reports an annual PM2.5 of 23.2 µg/m³. That's meaningfully above the WHO 2021 guideline of 5 µg/m³ yet within the EU annual limit of 25 µg/m³.
Chiayi City
Taiwan
TaiwanAnnual Average
ModerateWHO annual classification
23.2µg/m³
Jan
Feb
Mar
Apr
May
Jun
Jul
Aug
Sep
Oct
Nov
Dec
PM2.5
3232 µg/m³ — Poor
3535 µg/m³ — Unhealthy
3232 µg/m³ — Poor
2626 µg/m³ — Poor
1515 µg/m³ — Moderate
1212 µg/m³ — Fair
1515 µg/m³ — Fair
1313 µg/m³ — Fair
2121 µg/m³ — Moderate
2727 µg/m³ — Poor
2525 µg/m³ — Poor
2525 µg/m³ — Moderate
Jan
Feb
Mar
Apr
May
Jun
3232 µg/m³ — Poor
3535 µg/m³ — Unhealthy
3232 µg/m³ — Poor
2626 µg/m³ — Poor
1515 µg/m³ — Moderate
1212 µg/m³ — Fair
Jul
Aug
Sep
Oct
Nov
Dec
1515 µg/m³ — Fair
1313 µg/m³ — Fair
2121 µg/m³ — Moderate
2727 µg/m³ — Poor
2525 µg/m³ — Poor
2525 µg/m³ — Moderate
Best months: Jun–AugWorst months: Jan–Mar
Fair10–15 µg/m³Moderate15–25 µg/m³Poor25–35 µg/m³Unhealthy35–50 µg/m³
Based on WUSTL PM2.5 dataset (2020–2024) · WHO 2021 thresholds
Confidence: ●●●
How air quality compares
Compared across Taiwan
Chiayi City: 23.2 µg/m³. Typical range in Taiwan: 16.5–22.6 µg/m³. Low anchor: Hengchun, 10.1 µg/m³. High anchor: Yuanlin, 24.8 µg/m³.
37 cities tracked