What is the air quality trend in Hōryūji?

Over the past 8 days, Hōryūji had an average AQI of 63 based on station measurements. The worst day was 2026-10-14 with AQI 85.

How is Hōryūji air quality measured?

Air quality in Hōryūji 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 Hōryūji, Japan

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

165h

PM2.5 Station

165h · 69 stations

Temperature GFS model

28pt

Precipitation GFS model

mm/day

Daily Summary Station

Date	AQI	Range	PM2.5 avg	Hours	Stations
2026-10-21	42	33–65	10.5 µg/m³	7h	73
2026-10-20	50	32–71	12.8 µg/m³	24h	69
2026-10-19	60	39–80	16.7 µg/m³	24h	64
2026-10-18	42	28–73	10.4 µg/m³	24h	71
2026-10-17	65	37–117	18.9 µg/m³	24h	68
2026-10-16	77	43–154	24.4 µg/m³	24h	55
2026-10-15	85	50–153	27.5 µg/m³	24h	70
2026-10-14	85	31–154	28.5 µg/m³	14h	54

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