Worst air pollution Ayase, today and tomorrow
Today (21 September): Air quality in Ayase is poor. AQI and NO2 are poor; PM1 is moderate; PM2.5, PM10, and SO2 are fair; O3, CO, and HCHO are good. Pollution peaks around 1:00 PM (NO2: 72.7/100).
Tomorrow (22 September 2026): Air quality in Ayase 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 poor; all other pollutants stay as today. Pollution peaks around 5:00 PM (NO2: 96.9/100). Airmine updates local air quality forecasts four times daily.
Get the full experience in the Airmine app.
Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
Follow your pollen exposure and performance with the free Airmine–Strava integration. See your pollen and air quality exposure for every Strava activity.
Ayase's air quality reflects the Kanagawa Prefecture flat Sagami River plain position adjacent to the JGSDF Sagami General Depot, with vehicle traffic on surrounding roads and the military logistics and manufacturing character contributing elevated NOₓ alongside primary vehicle sources. The flat Kanto Plain allows reasonable dispersal, while the broader Tokyo-Yokohama metropolitan regional emissions elevate background and Ayase generally maintains moderate Kanagawa suburban corridor readings throughout most of the year.
Today - 21 September | Pollution peaks at 13:00
AQI:
Poor
72.7/100
PM2.5 (fine particles):
Fair
39.0/100
PM10 (coarse particles):
Fair
28.5/100
NO2 (nitrogen dioxide):
Poor
72.7/100
O3 (ozone):
Good
10.0/100
SO2 (sulfur dioxide):
Fair
24.2/100
CO (carbon monoxide):
Good
0.9/100
HCHO (formaldehyde):
Good
5.1/100
PM1 (ultrafine particles):
Moderate
51.2/100
Levels show the poorest local air quality during the day
Tomorrow - 22 September | Pollution peaks at 17:00
AQI:
Very poor
96.9/100
PM2.5 (fine particles):
Moderate
47.1/100
PM10 (coarse particles):
Moderate
42.5/100
NO2 (nitrogen dioxide):
Very poor
96.9/100
O3 (ozone):
Good
12.7/100
SO2 (sulfur dioxide):
Fair
37.8/100
CO (carbon monoxide):
Good
1.6/100
HCHO (formaldehyde):
Good
7.7/100
PM1 (ultrafine particles):
Poor
71.6/100
Frequently Asked Questions
Is air quality bad in Ayase right now?
On 21 September 2026, overall air quality in Ayase is poor. AQI is the main air quality indicator at 72.7/100. Pollution peaks around 1:00 PM (NO2: 72.7/100).
Will air quality be worse tomorrow in Ayase?
On 22 September 2026, air quality conditions in Ayase will be worse than today, with AQI forecast at very poor at 96.9/100. Pollution peaks around 5:00 PM (NO2: 96.9/100).
When is air pollution at its worst in Ayase?
Ayase usually sees its poorest air quality when traffic emissions, aircraft operations at the local air base, along with manufacturing activity coincide with periods when winds are light and dispersion is poor. Local weather patterns add further variation on top of these sources. Background emissions and local weather both play a role in day-to-day changes.
Are air quality levels in Ayase 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.
Check air quality in other popular cities:
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.
Get the full experience in the Airmine app.