What is the air quality trend in Chiba?

Over the past 8 days, Chiba had an average AQI of 41 based on station measurements. The worst day was 2026-10-16 with AQI 52.

How is Chiba air quality measured?

Air quality in Chiba 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 Chiba, Japan

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

166h

PM2.5 Station

166h · 81 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	PM10 avg	Hours	Stations
2026-10-21	32	28–36	7.7 µg/m³	12.8	10h	76
2026-10-20	42	32–59	10.2 µg/m³	22.0	24h	75
2026-10-19	45	32–70	11.0 µg/m³	13.9	24h	74
2026-10-18	34	26–43	8.1 µg/m³	9.4	24h	78
2026-10-17	42	34–58	10.1 µg/m³	11.6	24h	72
2026-10-16	52	38–71	13.0 µg/m³	15.7	24h	65
2026-10-15	44	28–85	10.9 µg/m³	11.7	24h	68
2026-10-14	44	29–104	11.9 µg/m³	5.3	12h	65

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