What is the air quality trend in Chiayi City?

Over the past 15 days, Chiayi City had an average AQI of 55 based on station measurements. The worst day was 2026-05-30 with AQI 62.

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 CAMS model

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

333h

PM2.5 Station

333h · 7 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-05-30	62	52–76	17.1 µg/m³	10h	8
2026-05-29	55	25–70	14.7 µg/m³	24h	9
2026-05-28	58	43–122	15.5 µg/m³	24h	9
2026-05-27	54	38–91	14.0 µg/m³	24h	9
2026-05-26	53	34–95	13.8 µg/m³	24h	8
2026-05-25	53	40–67	13.6 µg/m³	24h	10
2026-05-24	54	34–72	13.8 µg/m³	24h	9
2026-05-23	57	42–86	15.4 µg/m³	24h	10
2026-05-22	59	32–86	16.3 µg/m³	24h	10
2026-05-21	59	40–96	16.4 µg/m³	24h	9
2026-05-20	51	33–78	13.0 µg/m³	24h	10
2026-05-19	54	34–69	14.0 µg/m³	24h	10
2026-05-18	52	33–89	13.4 µg/m³	24h	9
2026-05-17	53	36–83	13.9 µg/m³	23h	10
2026-05-16	52	39–64	13.3 µg/m³	12h	9

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