What is the air quality trend in Hiroshima?

Over the past 8 days, Hiroshima had an average AQI of 46 based on station measurements. The worst day was 2026-10-14 with AQI 69.

How is Hiroshima air quality measured?

Air quality in Hiroshima 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 Hiroshima, Japan

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

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

Current AQI
Good Station

48 Hours 7 Days 14 Days 20 Days

CSV JSON

Air Quality Index Station

164h

PM2.5 Station

164h · 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	26	20–28	6.0 µg/m³	4h	15
2026-10-20	42	16–128	11.3 µg/m³	24h	14
2026-10-19	45	23–153	12.6 µg/m³	24h	11
2026-10-18	33	22–48	7.9 µg/m³	24h	16
2026-10-17	43	30–79	10.7 µg/m³	24h	12
2026-10-16	59	30–160	17.7 µg/m³	23h	11
2026-10-15	56	24–160	17.4 µg/m³	24h	11
2026-10-14	69	23–157	22.2 µg/m³	17h	11

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