Worst air pollution Kōtō-ku, today and tomorrow
Today (21 September): Air quality in Kōtō-ku is fair. AQI, NO2, and PM1 are fair; PM2.5, PM10, O3, SO2, CO, and HCHO are good. Pollution peaks around 2:00 PM (NO2: 36.4/100).
Tomorrow (22 September 2026): Air quality in Kōtō-ku is very poor. AQI worsens to very poor; PM2.5 increases to moderate; PM10 increases to fair; NO2 increases to very poor; SO2 increases to fair; all other pollutants stay as today. Pollution peaks around 4:00 PM (NO2: 80.5/100). 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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Kōtō-ku's air quality reflects the southeastern Tokyo metropolitan waterfront corridor on Tokyo Bay, with vehicle traffic on surrounding expressways and the dense urban commercial and industrial character alongside the Tokyo container port operations contributing elevated NOₓ and maritime PM2.5. Tokyo Bay's industrial waterfront creates background industrial emissions, while summer photochemical ozone from the vast Kanto corridor is the primary warm-season concern and Koto generally maintains moderate Tokyo southeastern waterfront corridor readings throughout most of the year.
Today - 21 September | Pollution peaks at 14:00
AQI:
Fair
36.4/100
PM2.5 (fine particles):
Good
19.9/100
PM10 (coarse particles):
Good
12.7/100
NO2 (nitrogen dioxide):
Fair
36.4/100
O3 (ozone):
Good
7.3/100
SO2 (sulfur dioxide):
Good
8.5/100
CO (carbon monoxide):
Good
0.7/100
HCHO (formaldehyde):
Good
2.2/100
PM1 (ultrafine particles):
Fair
21.8/100
Levels show the poorest local air quality during the day
Tomorrow - 22 September | Pollution peaks at 16:00
AQI:
Very poor
80.5/100
PM2.5 (fine particles):
Moderate
41.2/100
PM10 (coarse particles):
Fair
24.1/100
NO2 (nitrogen dioxide):
Very poor
80.5/100
O3 (ozone):
Good
11.0/100
SO2 (sulfur dioxide):
Fair
20.9/100
CO (carbon monoxide):
Good
1.3/100
HCHO (formaldehyde):
Good
6.4/100
PM1 (ultrafine particles):
Fair
38.5/100
Frequently Asked Questions
Is air quality bad in Kōtō-ku right now?
On 21 September 2026, overall air quality in Kōtō-ku is fair. AQI is the main air quality indicator at 36.4/100. Pollution peaks around 2:00 PM (NO2: 36.4/100).
Will air quality be worse tomorrow in Kōtō-ku?
On 22 September 2026, air quality conditions in Kōtō-ku will be worse than today, with AQI forecast at very poor at 80.5/100. Pollution peaks around 4:00 PM (NO2: 80.5/100).
When is air pollution at its worst in Kōtō-ku?
Pollution in Kōtō-ku typically rises when vehicle traffic, heavy industry such as steel, cement, or petrochemical processing, as well as harbour and shipping traffic combine, especially once windblown dust events occur. 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 Kōtō-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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