What is the air quality trend in Nikkō?

Over the past 20 days, Nikkō had an average AQI of 37 based on station measurements. The worst day was 2026-05-16 with AQI 53.

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

474h

PM2.5 Station

474h · 10 stations

Temperature GFS model

80pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-05-28	30	20–46	7.2 µg/m³	23h	9
2026-05-27	32	15–48	7.8 µg/m³	24h	10
2026-05-26	31	20–44	7.3 µg/m³	24h	10
2026-05-25	34	26–46	8.3 µg/m³	24h	9
2026-05-24	37	20–54	9.0 µg/m³	24h	9
2026-05-23	38	18–53	9.1 µg/m³	24h	10
2026-05-22	30	19–41	7.1 µg/m³	24h	9
2026-05-21	28	18–48	6.8 µg/m³	24h	8
2026-05-20	36	18–62	8.8 µg/m³	24h	10
2026-05-19	43	25–78	11.0 µg/m³	24h	10
2026-05-18	49	31–61	12.4 µg/m³	24h	10
2026-05-17	48	35–61	11.7 µg/m³	22h	10
2026-05-16	53	40–60	13.6 µg/m³	21h	10
2026-05-15	51	29–64	12.9 µg/m³	24h	9
2026-05-14	46	31–56	11.2 µg/m³	24h	10
2026-05-13	37	27–49	8.8 µg/m³	24h	10
2026-05-12	33	21–48	7.9 µg/m³	24h	10
2026-05-11	37	15–68	9.1 µg/m³	24h	7
2026-05-10	36	25–49	8.6 µg/m³	24h	8
2026-05-09	28	21–38	6.6 µg/m³	24h	10

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