What is the air quality trend in Chōfu?

Over the past 8 days, Chōfu had an average AQI of 42 based on station measurements. The worst day was with AQI .

How is Chōfu air quality measured?

Air quality in Chōfu 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 Chōfu, Japan

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

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

Current AQI
Moderate

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Trend

157h

PM2.5 Trend

157h · 15 stations

Daily Summary

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-04-17	38	34–40	9.0 µg/m³	11.2	6h	17
2026-04-16	30	25–41	7.3 µg/m³	10.3	24h	21
2026-04-15	34	23–46	8.3 µg/m³	12.6	24h	21
2026-04-14	53	45–62	13.5 µg/m³	21.3	24h	20
2026-04-13	50	27–57	12.1 µg/m³	19.8	17h	17
2026-04-12	45	35–53	10.8 µg/m³	16.4	24h	19
2026-04-11	46	28–60	11.6 µg/m³	17.2	24h	20
2026-04-10	44	15–56	10.7 µg/m³	18.5	14h	18

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