Worst air pollution Ōta-ku, today and tomorrow
Today (21 September): Air quality in Ōta-ku is poor. AQI and NO2 are poor; PM2.5, PM10, SO2, and PM1 are fair; O3, CO, and HCHO are good. Pollution peaks around 1:00 PM (NO2: 73.1/100).
Tomorrow (22 September 2026): Air quality in Ōta-ku is very poor. AQI worsens to very poor; PM2.5 increases to moderate; PM10 increases to moderate; NO2 increases to very poor; PM1 increases to moderate; all other pollutants stay as today. Pollution peaks around 5:00 PM (NO2: 97.4/100). 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-ku's air quality reflects the southeastern Tokyo metropolitan corridor adjacent to Haneda Airport, with the airport's concentrated aviation operations and vehicle traffic on surrounding expressways generating elevated NOₓ and ultrafine particles. Tokyo Bay's maritime influence provides limited coastal ventilation, while the airport's flight operations represent the most distinctive local emission source and summer photochemical ozone from the vast Kanto metropolitan corridor is the primary warm-season concern throughout the year.
Today - 21 September | Pollution peaks at 13:00
AQI:
Poor
73.1/100
PM2.5 (fine particles):
Fair
35.8/100
PM10 (coarse particles):
Fair
28.5/100
NO2 (nitrogen dioxide):
Poor
73.1/100
O3 (ozone):
Good
8.7/100
SO2 (sulfur dioxide):
Fair
24.2/100
CO (carbon monoxide):
Good
0.9/100
HCHO (formaldehyde):
Good
5.1/100
PM1 (ultrafine particles):
Fair
30.8/100
Levels show the poorest local air quality during the day
Tomorrow - 22 September | Pollution peaks at 17:00
AQI:
Very poor
97.4/100
PM2.5 (fine particles):
Moderate
45.7/100
PM10 (coarse particles):
Moderate
42.5/100
NO2 (nitrogen dioxide):
Very poor
97.4/100
O3 (ozone):
Good
11.0/100
SO2 (sulfur dioxide):
Fair
37.8/100
CO (carbon monoxide):
Good
1.6/100
HCHO (formaldehyde):
Good
7.7/100
PM1 (ultrafine particles):
Moderate
44.9/100
Frequently Asked Questions
Is air quality bad in Ōta-ku right now?
On 21 September 2026, overall air quality in Ōta-ku is poor. AQI is the main air quality indicator at 73.1/100. Pollution peaks around 1:00 PM (NO2: 73.1/100).
Will air quality be worse tomorrow in Ōta-ku?
On 22 September 2026, air quality conditions in Ōta-ku will be worse than today, with AQI forecast at very poor at 97.4/100. Pollution peaks around 5:00 PM (NO2: 97.4/100).
When is air pollution at its worst in Ōta-ku?
The biggest local contributors to pollution in Ōta-ku are road traffic, airport and aviation operations, and steel, cement, and chemical production, particularly once hot, still weather settles in. Heat and sunlight combine with emissions to form ozone at ground level. Onshore breezes usually help clear the air, but pollution can build up when winds are light.
Are air quality levels in Ōta-ku 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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