Worst air pollution Tachikawa, today and tomorrow
Today (21 September): Air quality in Tachikawa is very poor. AQI and NO2 are very poor; PM1 is moderate; PM2.5, PM10, and SO2 are fair; O3, CO, and HCHO are good. Pollution peaks around 1:00 PM (NO2: 85.4/100).
Tomorrow (22 September 2026): Air quality in Tachikawa is very poor. PM2.5 increases to moderate; PM10 increases to moderate; PM1 increases to poor; all other pollutants stay as today. Pollution peaks around 5:00 PM (NO2: 100/100). 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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Tachikawa's air quality reflects the western Tokyo metropolitan Tama area position adjacent to Showa Memorial Park, with vehicle traffic on surrounding roads and the US Air Force Yokota Air Base's military aviation operations and the manufacturing and commercial character contributing elevated NOₓ alongside primary vehicle sources. The flat Kanto Plain allows reasonable dispersal, while the military aviation operations represent the most distinctive local emission source throughout the year.
Today - 21 September | Pollution peaks at 13:00
AQI:
Very poor
85.4/100
PM2.5 (fine particles):
Fair
39.1/100
PM10 (coarse particles):
Fair
28.5/100
NO2 (nitrogen dioxide):
Very poor
85.4/100
O3 (ozone):
Good
11.0/100
SO2 (sulfur dioxide):
Fair
24.2/100
CO (carbon monoxide):
Good
0.9/100
HCHO (formaldehyde):
Good
5.1/100
PM1 (ultrafine particles):
Moderate
49.7/100
Levels show the poorest local air quality during the day
Tomorrow - 22 September | Pollution peaks at 17:00
AQI:
Very poor
100/100
PM2.5 (fine particles):
Moderate
47.2/100
PM10 (coarse particles):
Moderate
42.5/100
NO2 (nitrogen dioxide):
Very poor
100/100
O3 (ozone):
Good
14.0/100
SO2 (sulfur dioxide):
Fair
37.8/100
CO (carbon monoxide):
Good
1.6/100
HCHO (formaldehyde):
Good
7.7/100
PM1 (ultrafine particles):
Poor
69.0/100
Frequently Asked Questions
Is air quality bad in Tachikawa right now?
On 21 September 2026, overall air quality in Tachikawa is very poor. AQI is the main air quality indicator at 85.4/100. Pollution peaks around 1:00 PM (NO2: 85.4/100).
Will air quality be worse tomorrow in Tachikawa?
On 22 September 2026, air quality conditions in Tachikawa will be similar to today, with AQI forecast at very poor at 100/100. Pollution peaks around 5:00 PM (NO2: 100/100).
When is air pollution at its worst in Tachikawa?
Pollution in Tachikawa typically rises when road traffic, aircraft operations at the local air base, together with textile and manufacturing operations combine, especially once winds are light and dispersion is poor. Day-to-day conditions here depend heavily on the weather. Conditions can otherwise vary considerably with the weather.
Are air quality levels in Tachikawa 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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