Worst air pollution Sayama, today and tomorrow
Today (21 September): Air quality in Sayama is moderate. AQI and NO2 are moderate; PM1 is fair; PM2.5, PM10, O3, SO2, CO, and HCHO are good. Pollution peaks around 12:00 PM (NO2: 46.4/100).
Tomorrow (22 September 2026): Air quality in Sayama 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; PM1 increases to moderate; all other pollutants stay as today. Pollution peaks around 6:00 PM (NO2: 83.8/100). 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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Sayama's air quality reflects the flat Saitama Iruma River plain position adjacent to the Honda Sayama plant, with vehicle traffic on surrounding roads and the Honda automotive manufacturing — Sayama hosting Honda's historic main factory — generating elevated automotive industrial and vehicle testing emissions. The flat Kanto Plain allows reasonable dispersal, while summer photochemical ozone from the Kanto corridor is the primary warm-season concern and Sayama's automotive character creates a distinctive local emission profile throughout the year.
Today - 21 September | Pollution peaks at 12:00
AQI:
Moderate
46.4/100
PM2.5 (fine particles):
Good
14.7/100
PM10 (coarse particles):
Good
11.0/100
NO2 (nitrogen dioxide):
Moderate
46.4/100
O3 (ozone):
Good
9.9/100
SO2 (sulfur dioxide):
Good
4.5/100
CO (carbon monoxide):
Good
0.7/100
HCHO (formaldehyde):
Good
6.5/100
PM1 (ultrafine particles):
Fair
32.6/100
Levels show the poorest local air quality during the day
Tomorrow - 22 September | Pollution peaks at 18:00
AQI:
Very poor
83.8/100
PM2.5 (fine particles):
Moderate
40.9/100
PM10 (coarse particles):
Fair
30.3/100
NO2 (nitrogen dioxide):
Very poor
83.8/100
O3 (ozone):
Good
17.0/100
SO2 (sulfur dioxide):
Fair
25.5/100
CO (carbon monoxide):
Good
1.3/100
HCHO (formaldehyde):
Good
7.9/100
PM1 (ultrafine particles):
Moderate
59.9/100
Frequently Asked Questions
Is air quality bad in Sayama right now?
On 21 September 2026, overall air quality in Sayama is moderate. AQI is the main air quality indicator at 46.4/100. Pollution peaks around 12:00 PM (NO2: 46.4/100).
Will air quality be worse tomorrow in Sayama?
On 22 September 2026, air quality conditions in Sayama will be worse than today, with AQI forecast at very poor at 83.8/100. Pollution peaks around 6:00 PM (NO2: 83.8/100).
When is air pollution at its worst in Sayama?
In Sayama, traffic emissions, steel, cement, and chemical production, and textile and manufacturing operations are the main local sources, with conditions worsening when dry spells bring strong winds. Strong seasonal winds can lift dust from the surrounding dry terrain and push particulate levels sharply higher. Photochemical reactions in the heat push ozone levels higher.
Are air quality levels in Sayama 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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