What is the air quality trend in Chiayi City?

Over the past 8 days, Chiayi City had an average AQI of 79 based on station measurements. The worst day was 2026-10-15 with AQI 94.

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

163h

PM2.5 Station

163h · 4 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-10-21	72	72–72	22.3 µg/m³	1h	4
2026-10-20	93	51–338	42.0 µg/m³	24h	7
2026-10-19	64	48–127	18.5 µg/m³	24h	6
2026-10-18	91	52–225	34.6 µg/m³	24h	9
2026-10-17	77	51–155	24.4 µg/m³	24h	6
2026-10-16	76	26–160	24.4 µg/m³	24h	4
2026-10-15	94	57–164	32.6 µg/m³	23h	5
2026-10-14	72	42–116	22.3 µg/m³	19h	4

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