Worst air pollution Chiyoda-ku, today and tomorrow
Today (16 July): Air quality in Chiyoda-ku is fair. PM2.5, NO2, SO2, and PM1 are fair; AQI and O3 are medium; PM10, CO, and HCHO are good. Pollution peaks around 1:00 PM (O3: 52.8/100).
Tomorrow (17 July 2026): Air quality in Chiyoda-ku is fair. NO2 decreases to medium; O3 decreases to good; all other pollutants stay as today. Pollution peaks around 5:00 AM (NO2: 40.8/100). Airmine updates local air quality forecasts four times daily.
For long term forecasts and maps, see the Airmine app
Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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Chiyoda-ku's air quality reflects Tokyo's central government and imperial palace district, with vehicle traffic on surrounding expressways and the extraordinary concentration of national government ministries, Diet Building, and corporate headquarters generating sustained NO₂. The Imperial Palace park provides limited green space ventilation, while the broader Tokyo metropolitan regional background elevates all readings and summer photochemical ozone is the primary warm-season concern throughout the year.
Today - 16 July | Pollution peaks at 13:00
AQI:
Medium
52.8/100
PM2.5 (fine particles):
Fair
25.1/100
PM10 (coarse particles):
Good
7.2/100
NO2 (nitrogen dioxide):
Fair
37.4/100
O3 (ozone):
Medium
52.8/100
SO2 (sulfur dioxide):
Fair
22.9/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
11.5/100
PM1 (ultrafine particles):
Fair
30.7/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 05:00
AQI:
Medium
40.8/100
PM2.5 (fine particles):
Fair
25.6/100
PM10 (coarse particles):
Good
7.1/100
NO2 (nitrogen dioxide):
Medium
40.8/100
O3 (ozone):
Good
15.4/100
SO2 (sulfur dioxide):
Fair
37.0/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
7.4/100
PM1 (ultrafine particles):
Fair
32.2/100
Frequently Asked Questions
Is air quality bad in Chiyoda-ku right now?
On 16 July 2026, overall air quality in Chiyoda-ku is fair. NO2 is the main pollutant at 37.4/100. Pollution peaks around 1:00 PM (O3: 52.8/100).
Will air quality be worse tomorrow in Chiyoda-ku?
On 17 July 2026, air quality conditions in Chiyoda-ku will be similar to today, with SO2 forecast at fair at 37.0/100. Pollution peaks around 5:00 AM (NO2: 40.8/100).
When is air pollution at its worst in Chiyoda-ku?
The biggest local contributors to pollution in Chiyoda-ku are traffic emissions along with heavy industry such as steel, cement, or petrochemical processing, particularly once warm, sunny weather takes hold. Strong sunlight reacting with local emissions drives up ground-level ozone. Cooler temperatures for the rest of the year keep this in check.
Are air quality levels in Chiyoda-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.
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Data provided by Airmine — Last update: 16 July 2026 at 10:33 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.
For long term forecasts and maps, see the Airmine app