What is the air quality trend in Kokubunji?

Over the past 7 days, Kokubunji had an average AQI of 37 based on station measurements. The worst day was 2026-10-20 with AQI 74.

How is Kokubunji air quality measured?

Air quality in Kokubunji 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 Kokubunji, Japan

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

149h

PM2.5 Station

149h · 1 station

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-10-20	74	12–98	23.8 µg/m³	27.1	24h	1
2026-10-19	41	1–82	12.1 µg/m³	14.0	23h	1
2026-10-18	17	1–36	4.1 µg/m³	4.7	23h	1
2026-10-17	33	5–66	8.0 µg/m³	9.2	24h	1
2026-10-16	45	10–82	12.0 µg/m³	13.5	24h	1
2026-10-15	30	2–62	7.4 µg/m³	9.0	23h	1
2026-10-14	23	4–59	5.8 µg/m³	7.0	8h	1

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