Worst air pollution Ōta, today and tomorrow
Today (10 August): Air quality in Ōta is medium. AQI and O3 are medium; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 12:00 PM (O3: 50.6/100).
Tomorrow (11 August 2026): Air quality in Ōta is fair. AQI worsens to fair; O3 increases to fair; all other pollutants stay as today. Pollution peaks around 11:00 AM (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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Ōta in Gunma reflects the flat Gunma Prefecture Tone River plain at the Kantō Plain's northern edge, with vehicle traffic on surrounding roads and the Subaru automotive manufacturing — Ōta being Subaru's global headquarters — generating elevated automotive industrial and vehicle testing emissions. The flat Kanto Plain generally allows reasonable dispersal, while summer photochemical ozone from the Kanto corridor is the primary warm-season concern and Ota's automotive manufacturing character creates a distinctive local emission profile throughout the year.
Today - 10 August | Pollution peaks at 12:00
AQI:
Medium
50.6/100
PM2.5 (fine particles):
Good
14.0/100
PM10 (coarse particles):
Good
3.7/100
NO2 (nitrogen dioxide):
Good
11.0/100
O3 (ozone):
Medium
50.6/100
SO2 (sulfur dioxide):
Good
3.7/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
15.9/100
PM1 (ultrafine particles):
Good
19.9/100
Levels show the poorest local air quality during the day
Tomorrow - 11 August | Pollution peaks at 11:00
AQI:
Fair
38.7/100
PM2.5 (fine particles):
Good
5.9/100
PM10 (coarse particles):
Good
1.7/100
NO2 (nitrogen dioxide):
Good
9.6/100
O3 (ozone):
Fair
38.7/100
SO2 (sulfur dioxide):
Good
3.1/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
8.2/100
PM1 (ultrafine particles):
Good
7.5/100
Frequently Asked Questions
Is air quality bad in Ōta right now?
On 10 August 2026, overall air quality in Ōta is medium. AQI is the main air quality indicator at 50.6/100. Pollution peaks around 12:00 PM (O3: 50.6/100).
Will air quality be worse tomorrow in Ōta?
On 11 August 2026, air quality conditions in Ōta will be worse than today, with AQI forecast at fair at 38.7/100. Pollution peaks around 11:00 AM (O3: 38.7/100).
When is air pollution at its worst in Ōta?
In Ōta, vehicle traffic, heavy industry such as steel, cement, or petrochemical processing, together with manufacturing activity are the main local sources, with conditions worsening when dry, windy weather picks up. Dust carried on these winds adds substantially to particulate levels. Heat and sunlight combine with emissions to form ozone at ground level.
Are air quality levels in Ōta 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.
Why doesn’t the forecast always reflect wildfire impacts?
Airmine’s forecast uses CAMS (Copernicus Atmosphere Monitoring Service) as its background atmospheric model. While CAMS includes wildfire emissions, these are derived from satellite observations and are not available in real time. During rapidly evolving wildfire events, there may therefore be a delay before increased emissions are incorporated into the model. As a result, the forecast may temporarily underestimate PM₂.₅ and other pollutants associated with wildfire smoke.
During rapidly evolving wildfire events, CAMS may lag by approximately 1–2 days before increased wildfire emissions are fully represented, which can lead to temporary underestimation of PM₂.₅ concentrations in Airmine’s forecast.
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Data provided by Airmine — Last update: 9 August 2026 at 20:27 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.
Disclaimer: Forecasts are provided for informational purposes only and should not be relied upon as medical advice. Actual pollen and air quality conditions may vary from the forecast. If you have allergies, asthma, or another medical condition, consult a healthcare professional. Please see our Terms of Service for important information about limitations of liability.
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