Highest air pollution Hiroshima, today and tomorrow
Today (29 June): Air quality in Hiroshima is medium. AQI and O3 are medium; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 4:00 PM (O3: 47.3/100).
Tomorrow (30 June 2026): Air quality in Hiroshima is fair. PM1 increases to fair; all other pollutants stay as today. Pollution peaks around 12:00 PM (O3: 41.1/100). Airmine updates local air quality forecasts four times daily.
For long term forecasts and maps, see the Airmine app
Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
Hiroshima's air quality benefits from its exceptional Seto Inland Sea coastal position on Hiroshima Bay, with consistent Seto Inland Sea and Pacific maritime breezes providing reliable ventilation. Vehicle traffic on surrounding expressways and the automotive manufacturing — Hiroshima being Mazda's global headquarters — and services corridor contribute local sources, while the outstanding coastal exposure and the Chugoku Mountains rising inland create topographic variation and Hiroshima generally maintains moderate to good conditions for a major Japanese industrial coastal city.
Today - 29 June | Pollution peaks at 16:00
AQI:
Medium
47.3/100
PM2.5 (fine particles):
Good
14.9/100
PM10 (coarse particles):
Good
4.2/100
NO2 (nitrogen dioxide):
Good
16.3/100
O3 (ozone):
Medium
47.3/100
SO2 (sulfur dioxide):
Good
4.4/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
9.1/100
PM1 (ultrafine particles):
Good
19.9/100
Levels show the poorest local air quality during the day
Tomorrow - 30 June | Pollution peaks at 12:00
AQI:
Medium
41.1/100
PM2.5 (fine particles):
Good
19.4/100
PM10 (coarse particles):
Good
5.3/100
NO2 (nitrogen dioxide):
Good
18.5/100
O3 (ozone):
Medium
41.1/100
SO2 (sulfur dioxide):
Good
7.3/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
10.2/100
PM1 (ultrafine particles):
Fair
24.7/100
Pollen forecast in Hiroshima
View pollen forecastFrequently Asked Questions
Is air quality bad in Hiroshima right now?
On 29 June 2026, overall air quality in Hiroshima is medium. AQI is the main air quality indicator at 47.3/100. Pollution peaks around 4:00 PM (O3: 47.3/100).
Will air quality be worse tomorrow in Hiroshima?
On 30 June 2026, air quality conditions in Hiroshima will be worse than today, with PM1 forecast at fair at 24.7/100. Pollution peaks around 12:00 PM (O3: 41.1/100).
Are air quality levels in Hiroshima based on measurements or forecasts?
It is forecasts derived by downscaling forecasts provided by EU’s Copernicus Atmosphere Monitoring Service (CAMS) by taking into account local conditions such as traffic patterns. CAMS bases its forecast on satellite measurements of particles and chemical compounds in the atmosphere. Airmine’s services were developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team.
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Data provided by Airmine — Last update: 28 June 2026 at 18:36 CET (Data is updated four times daily.)
This forecast is produced independently using Airmine's own atmospheric data and models.
Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.
For long term forecasts and maps, see the Airmine app
Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team