What is the air quality trend in Chiayi City?

Over the past 8 days, Chiayi City had an average AQI of 56 based on station measurements. The worst day was 2026-07-18 with AQI 66.

How is Chiayi City air quality measured?

Air quality in Chiayi City is measured by ground-level monitoring stations that report PM2.5 and PM10 concentrations hourly. CERNS.IO aggregates readings from nearby stations and converts PM2.5 to the US EPA Air Quality Index (AQI) scale.

Air Quality History for Chiayi City, Taiwan

Name: Chiayi City Air Quality History
Creator: CERNS.IO
License: https://creativecommons.org/licenses/by/4.0/

Historical PM2.5 and AQI trend from monitoring stations near Chiayi City, Taiwan.

Current AQI
Moderate Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

166h

PM2.5 Station

166h · 8 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-07-22	58	55–61	15.3 µg/m³	5h	12
2026-07-21	66	39–127	19.1 µg/m³	23h	6
2026-07-20	63	39–99	17.9 µg/m³	24h	5
2026-07-19	55	33–74	14.8 µg/m³	24h	7
2026-07-18	66	24–173	20.9 µg/m³	24h	8
2026-07-17	51	31–66	13.0 µg/m³	24h	8
2026-07-16	50	37–62	12.5 µg/m³	24h	9
2026-07-15	46	33–54	11.1 µg/m³	18h	9

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