Worst air pollution Kokubunji, today and tomorrow
Today (16 July): Air quality in Kokubunji is fair. PM2.5, NO2, and PM1 are fair; AQI and O3 are medium; PM10, SO2, CO, and HCHO are good. Pollution peaks around 1:00 PM (O3: 52.8/100).
Tomorrow (17 July 2026): Air quality in Kokubunji is fair. AQI worsens to fair; O3 decreases to good; SO2 increases to fair; all other pollutants stay as today. Pollution peaks around 5:00 AM (NO2: 33.8/100). 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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Kokubunji's air quality reflects the western Tokyo metropolitan residential and university corridor, with vehicle traffic on surrounding roads and the Hitachi R&D campus, university, and dense residential character contributing local sources. The flat Kanto Plain allows reasonable dispersal, while the broader Tokyo metropolitan regional emissions elevate background and summer photochemical ozone is the primary warm-season concern and Kokubunji generally maintains moderate Tokyo western suburban readings throughout most of the year.
Today - 16 July | Pollution peaks at 13:00
AQI:
Medium
52.8/100
PM2.5 (fine particles):
Fair
24.4/100
PM10 (coarse particles):
Good
7.0/100
NO2 (nitrogen dioxide):
Fair
30.3/100
O3 (ozone):
Medium
52.8/100
SO2 (sulfur dioxide):
Good
17.7/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
11.5/100
PM1 (ultrafine particles):
Fair
30.0/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 05:00
AQI:
Fair
33.8/100
PM2.5 (fine particles):
Fair
24.9/100
PM10 (coarse particles):
Good
6.9/100
NO2 (nitrogen dioxide):
Fair
33.8/100
O3 (ozone):
Good
15.4/100
SO2 (sulfur dioxide):
Fair
28.6/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
7.4/100
PM1 (ultrafine particles):
Fair
31.5/100
Frequently Asked Questions
Is air quality bad in Kokubunji right now?
On 16 July 2026, overall air quality in Kokubunji is fair. NO2 is the main pollutant at 30.3/100. Pollution peaks around 1:00 PM (O3: 52.8/100).
Will air quality be worse tomorrow in Kokubunji?
On 17 July 2026, air quality conditions in Kokubunji will be similar to today, with AQI forecast at fair at 33.8/100. Pollution peaks around 5:00 AM (NO2: 33.8/100).
When is air pollution at its worst in Kokubunji?
The biggest local contributors to pollution in Kokubunji are traffic on the surrounding roads together with heavy industry such as steel, cement, or petrochemical processing, particularly once summer heat and strong sunlight build up. Heat and sunlight combine with emissions to form ozone at ground level. Cooler temperatures for the rest of the year keep this in check.
Are air quality levels in Kokubunji 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