What is the air quality trend in Hayama?

Over the past 8 days, Hayama had an average AQI of 42 based on station measurements. The worst day was 2026-10-16 with AQI 53.

How is Hayama air quality measured?

Air quality in Hayama 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 Hayama, Japan

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

166h

PM2.5 Station

166h · 77 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	27–42	7.8 µg/m³	13.1	10h	68
2026-10-20	43	33–62	10.5 µg/m³	21.2	24h	66
2026-10-19	46	32–85	11.6 µg/m³	13.8	24h	67
2026-10-18	33	25–43	7.9 µg/m³	9.9	24h	72
2026-10-17	44	33–65	10.6 µg/m³	12.1	24h	68
2026-10-16	53	37–67	13.6 µg/m³	15.7	24h	62
2026-10-15	45	31–91	11.4 µg/m³	12.5	24h	65
2026-10-14	45	22–103	12.6 µg/m³	6.0	12h	59

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