What is the air quality trend in Hwaseong-si?

Over the past 8 days, Hwaseong-si had an average AQI of 40 based on station measurements. The worst day was 2026-10-21 with AQI 60.

How is Hwaseong-si air quality measured?

Air quality in Hwaseong-si 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 Hwaseong-si, South Korea

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

Historical PM2.5 and AQI trend from monitoring stations near Hwaseong-si, South Korea.

Current AQI
Moderate Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

165h

PM2.5 Station

165h · 24 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-10-21	60	57–63	16.2 µg/m³	2h	54
2026-10-20	39	20–55	9.5 µg/m³	24h	89
2026-10-19	33	18–49	8.0 µg/m³	24h	99
2026-10-18	33	15–52	8.0 µg/m³	24h	94
2026-10-17	43	21–58	10.5 µg/m³	24h	84
2026-10-16	47	20–66	12.1 µg/m³	24h	92
2026-10-15	37	25–49	8.9 µg/m³	24h	89
2026-10-14	31	18–42	7.5 µg/m³	19h	80

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