Worst air pollution Yamaguchi, today and tomorrow
Today (16 July): Air quality in Yamaguchi is poor. AQI and O3 are poor; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 4:00 PM (O3: 70.7/100).
Tomorrow (17 July 2026): Air quality in Yamaguchi is fair. AQI improves to fair; O3 decreases to fair; all other pollutants stay as today. Pollution peaks around 3:00 PM (O3: 38.7/100). Airmine updates local air quality forecasts four times daily.
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Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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Yamaguchi's air quality benefits from its exceptional Yamaguchi Prefecture Seto Inland Sea and Sea of Japan dual-coast position, with consistent maritime breezes providing reliable ventilation. Vehicle traffic on surrounding roads and the government, university, and manufacturing corridor contribute local sources, while the dual-coast maritime exposure and the surrounding Chugoku Mountains create topographic variation and Yamaguchi generally maintains good to moderate conditions for a major Japanese western Honshu prefectural capital throughout most of the year.
Today - 16 July | Pollution peaks at 16:00
AQI:
Poor
70.7/100
PM2.5 (fine particles):
Good
11.0/100
PM10 (coarse particles):
Good
5.1/100
NO2 (nitrogen dioxide):
Good
7.3/100
O3 (ozone):
Poor
70.7/100
SO2 (sulfur dioxide):
Good
3.6/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
6.0/100
PM1 (ultrafine particles):
Good
10.2/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 15:00
AQI:
Fair
38.7/100
PM2.5 (fine particles):
Good
15.0/100
PM10 (coarse particles):
Good
5.3/100
NO2 (nitrogen dioxide):
Good
12.5/100
O3 (ozone):
Fair
38.7/100
SO2 (sulfur dioxide):
Good
5.8/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
7.2/100
PM1 (ultrafine particles):
Good
20.0/100
Frequently Asked Questions
Is air quality bad in Yamaguchi right now?
On 16 July 2026, overall air quality in Yamaguchi is poor. AQI is the main air quality indicator at 70.7/100. Pollution peaks around 4:00 PM (O3: 70.7/100).
Will air quality be worse tomorrow in Yamaguchi?
On 17 July 2026, air quality conditions in Yamaguchi will be better than today, with AQI forecast at fair at 38.7/100. Pollution peaks around 3:00 PM (O3: 38.7/100).
When is air pollution at its worst in Yamaguchi?
Air quality in Yamaguchi tends to be worse when vehicle traffic along with light manufacturing build up and onshore breezes fall calm. Maritime airflow normally ventilates the area well, though calmer spells let levels rise. Areas further inland without this ventilation tend to fare worse.
Are air quality levels in Yamaguchi 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: 16 July 2026 at 10:33 CEST (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