What is the air quality trend in Chang-hua?

Over the past 3 days, Chang-hua had an average AQI of 68 based on station measurements. The worst day was 2026-10-20 with AQI 77.

How is Chang-hua air quality measured?

Air quality in Chang-hua 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 Chang-hua, Taiwan

Name: Chang-hua Air Quality History
Creator: CERNS.IO
License: https://creativecommons.org/licenses/by/4.0/

Historical PM2.5 and AQI trend from monitoring stations near Chang-hua, Taiwan.

Current AQI
Moderate Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

45h

PM2.5 Station

45h · 21 stations

Temperature GFS model

8pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-10-21	70	63–77	21.2 µg/m³	2h	20
2026-10-20	77	48–161	24.6 µg/m³	24h	13
2026-10-19	59	23–103	16.9 µg/m³	19h	8

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