Worst air pollution Ōta, today and tomorrow
Today (21 September): Air quality in Ōta is moderate. AQI and NO2 are moderate; PM2.5, PM10, O3, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 5:00 PM (NO2: 59.0/100).
Tomorrow (22 September 2026): Air quality in Ōta is poor. AQI worsens to poor; PM2.5 increases to fair; PM10 increases to fair; NO2 increases to poor; O3 increases to fair; all other pollutants stay as today. Pollution peaks around 7:00 PM (NO2: 68.1/100). 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 - 21 September | Pollution peaks at 17:00
AQI:
Moderate
59.0/100
PM2.5 (fine particles):
Good
17.3/100
PM10 (coarse particles):
Good
11.8/100
NO2 (nitrogen dioxide):
Moderate
59.0/100
O3 (ozone):
Good
8.5/100
SO2 (sulfur dioxide):
Good
2.6/100
CO (carbon monoxide):
Good
0.9/100
HCHO (formaldehyde):
Good
8.0/100
PM1 (ultrafine particles):
Good
10.5/100
Levels show the poorest local air quality during the day
Tomorrow - 22 September | Pollution peaks at 19:00
AQI:
Poor
68.1/100
PM2.5 (fine particles):
Fair
31.6/100
PM10 (coarse particles):
Fair
24.3/100
NO2 (nitrogen dioxide):
Poor
68.1/100
O3 (ozone):
Fair
20.2/100
SO2 (sulfur dioxide):
Good
4.2/100
CO (carbon monoxide):
Good
1.3/100
HCHO (formaldehyde):
Good
7.1/100
PM1 (ultrafine particles):
Good
19.6/100
Frequently Asked Questions
Is air quality bad in Ōta right now?
On 21 September 2026, overall air quality in Ōta is moderate. AQI is the main air quality indicator at 59.0/100. Pollution peaks around 5:00 PM (NO2: 59.0/100).
Will air quality be worse tomorrow in Ōta?
On 22 September 2026, air quality conditions in Ōta will be worse than today, with AQI forecast at poor at 68.1/100. Pollution peaks around 7:00 PM (NO2: 68.1/100).
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: 22 September 2026 at 02:59 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.
Some text on this page may be generated or summarised using artificial intelligence (AI). Wherever possible, AI-generated content is enriched with Airmine's proprietary data to improve its accuracy and relevance. However, AI-generated content may still contain errors, omissions, or inaccuracies.
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