Worst air pollution Sumida, today and tomorrow
Today (10 August): Air quality in Sumida is fair. AQI, NO2, and O3 are fair; PM2.5, PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 12:00 AM (NO2: 31.0/100).
Tomorrow (11 August 2026): Air quality in Sumida is fair. AQI improves to medium; NO2 decreases to medium; SO2 increases to fair; all other pollutants stay as today. Pollution peaks around 6:00 PM (NO2: 40.8/100). 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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Sumida's air quality reflects the eastern Tokyo metropolitan Sumida River corridor adjacent to Asakusa, with vehicle traffic on surrounding expressways and the dense urban commercial, entertainment, and residential character contributing elevated NOₓ. The Sumida River provides limited ventilation, 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 Sumida generally maintains moderate Tokyo eastern urban corridor readings throughout most of the year.
Today - 10 August | Pollution peaks at 00:00
AQI:
Fair
31.0/100
PM2.5 (fine particles):
Good
8.4/100
PM10 (coarse particles):
Good
2.7/100
NO2 (nitrogen dioxide):
Fair
31.0/100
O3 (ozone):
Fair
26.8/100
SO2 (sulfur dioxide):
Good
16.5/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
6.8/100
PM1 (ultrafine particles):
Good
8.2/100
Levels show the poorest local air quality during the day
Tomorrow - 11 August | Pollution peaks at 18:00
AQI:
Medium
40.8/100
PM2.5 (fine particles):
Good
10.6/100
PM10 (coarse particles):
Good
2.8/100
NO2 (nitrogen dioxide):
Medium
40.8/100
O3 (ozone):
Fair
34.0/100
SO2 (sulfur dioxide):
Fair
23.4/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
7.3/100
PM1 (ultrafine particles):
Good
15.0/100
Frequently Asked Questions
Is air quality bad in Sumida right now?
On 10 August 2026, overall air quality in Sumida is fair. AQI is the main air quality indicator at 31.0/100. Pollution peaks around 12:00 AM (NO2: 31.0/100).
Will air quality be worse tomorrow in Sumida?
On 11 August 2026, air quality conditions in Sumida will be similar to today, with O3 forecast at fair at 34.0/100. Pollution peaks around 6:00 PM (NO2: 40.8/100).
When is air pollution at its worst in Sumida?
Air quality in Sumida tends to be worse when traffic emissions as well as petrochemical and refining operations build up and summer heat and strong sunlight build up. Photochemical reactions in the heat push ozone levels higher. Readings are generally lower during the cooler, cloudier months.
Are air quality levels in Sumida 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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