What is the air quality trend in Nikkō?

Over the past 8 days, Nikkō had an average AQI of 52 based on station measurements. The worst day was 2026-10-15 with AQI 66.

How is Nikkō air quality measured?

Air quality in Nikkō 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 Nikkō, Japan

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

166h

PM2.5 Station

166h · 12 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-10-21	36	24–43	8.6 µg/m³	7h	12
2026-10-20	53	25–162	16.2 µg/m³	24h	10
2026-10-19	55	30–171	16.9 µg/m³	24h	10
2026-10-18	40	23–101	10.2 µg/m³	24h	11
2026-10-17	57	21–146	16.6 µg/m³	24h	9
2026-10-16	65	20–164	20.9 µg/m³	24h	9
2026-10-15	66	29–152	19.8 µg/m³	24h	9
2026-10-14	50	23–79	13.6 µg/m³	15h	9

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