What is the air quality trend in Kiryū?

Over the past 21 days, Kiryū had an average AQI of 35 based on station measurements. The worst day was 2026-05-09 with AQI 42.

How is Kiryū air quality measured?

Air quality in Kiryū 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 Kiryū, Japan

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

Historical PM2.5 and AQI trend from monitoring stations near Kiryū, Japan.

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

477h

PM2.5 Station

477h · 19 stations

Temperature GFS model

80pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-05-29	34	23–42	8.3 µg/m³	21h	20
2026-05-28	34	19–66	8.2 µg/m³	24h	19
2026-05-27	32	19–42	7.7 µg/m³	24h	20
2026-05-26	35	14–44	8.3 µg/m³	24h	20
2026-05-25	35	21–44	8.3 µg/m³	24h	17
2026-05-24	36	26–52	8.7 µg/m³	24h	21
2026-05-23	34	27–42	8.1 µg/m³	24h	18
2026-05-22	34	23–42	8.1 µg/m³	24h	18
2026-05-21	33	24–44	7.8 µg/m³	24h	19
2026-05-20	32	22–42	7.7 µg/m³	24h	18
2026-05-19	37	25–60	9.0 µg/m³	24h	18
2026-05-18	40	31–53	9.7 µg/m³	24h	19
2026-05-17	33	9–53	8.0 µg/m³	24h	17
2026-05-16	40	22–57	9.8 µg/m³	22h	19
2026-05-15	37	18–53	9.0 µg/m³	24h	19
2026-05-14	38	26–46	9.0 µg/m³	24h	19
2026-05-13	33	21–54	7.8 µg/m³	24h	21
2026-05-12	28	19–40	6.8 µg/m³	24h	21
2026-05-11	33	16–48	7.9 µg/m³	24h	21
2026-05-10	37	24–50	8.9 µg/m³	24h	21
2026-05-09	42	41–43	10.1 µg/m³	2h	18

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