Worst air pollution Hachiōji, today and tomorrow
Today (16 July): Air quality in Hachiōji is poor. AQI and O3 are poor; PM2.5 and PM1 are fair; PM10, NO2, SO2, CO, and HCHO are good. Pollution peaks around 1:00 PM (O3: 75.4/100).
Tomorrow (17 July 2026): Air quality in Hachiōji is fair. AQI improves to medium; O3 decreases to medium; all other pollutants stay as today. Pollution peaks around 12:00 PM (O3: 45.8/100). 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
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Hachiōji's air quality reflects the western Tokyo metropolitan corridor at the Tama Hills base, with vehicle traffic on surrounding roads and the university campus, manufacturing, and residential character contributing local sources. The Tama Hills create modest topographic variation above the flat Kanto Plain, while the broader Tokyo metropolitan regional emissions elevate background and summer photochemical ozone from the vast Kanto corridor is the primary warm-season concern and Hachioji generally maintains moderate Tokyo western suburban readings throughout most of the year.
Today - 16 July | Pollution peaks at 13:00
AQI:
Poor
75.4/100
PM2.5 (fine particles):
Fair
27.1/100
PM10 (coarse particles):
Good
7.6/100
NO2 (nitrogen dioxide):
Good
18.2/100
O3 (ozone):
Poor
75.4/100
SO2 (sulfur dioxide):
Good
12.1/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
13.3/100
PM1 (ultrafine particles):
Fair
32.6/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 12:00
AQI:
Medium
45.8/100
PM2.5 (fine particles):
Fair
25.6/100
PM10 (coarse particles):
Good
7.1/100
NO2 (nitrogen dioxide):
Good
17.6/100
O3 (ozone):
Medium
45.8/100
SO2 (sulfur dioxide):
Good
15.8/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
18.0/100
PM1 (ultrafine particles):
Fair
32.0/100
Frequently Asked Questions
Is air quality bad in Hachiōji right now?
On 16 July 2026, overall air quality in Hachiōji is poor. AQI is the main air quality indicator at 75.4/100. Pollution peaks around 1:00 PM (O3: 75.4/100).
Will air quality be worse tomorrow in Hachiōji?
On 17 July 2026, air quality conditions in Hachiōji will be better than today, with PM1 forecast at fair at 32.0/100. Pollution peaks around 12:00 PM (O3: 45.8/100).
When is air pollution at its worst in Hachiōji?
Hachiōji usually sees its poorest air quality when vehicle traffic, steel, cement, and chemical production, along with manufacturing and food processing coincide with periods when summer heat and strong sunlight build up. Strong sunlight reacting with local emissions drives up ground-level ozone. Readings are generally lower during the cooler, cloudier months.
Are air quality levels in Hachiōji 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