What is the air quality trend in Ryōgoku?

Over the past 8 days, Ryōgoku had an average AQI of 47 based on station measurements. The worst day was 2026-10-14 with AQI 66.

How is Ryōgoku air quality measured?

Air quality in Ryōgoku 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 Ryōgoku, Japan

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

165h

PM2.5 Station

165h · 42 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-10-21	33	30–36	7.9 µg/m³	8h	49
2026-10-20	45	32–99	11.4 µg/m³	24h	42
2026-10-19	47	32–68	12.0 µg/m³	24h	40
2026-10-18	35	28–53	8.4 µg/m³	24h	47
2026-10-17	45	27–64	11.1 µg/m³	24h	39
2026-10-16	61	40–112	17.0 µg/m³	24h	32
2026-10-15	50	21–109	13.8 µg/m³	24h	36
2026-10-14	66	23–179	24.1 µg/m³	13h	33

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