Worst air pollution Sayama, Osaka, today and tomorrow
Today (21 September): Air quality in Sayama, Osaka is fair. AQI, NO2, and PM1 are fair; PM2.5, PM10, O3, SO2, CO, and HCHO are good. Pollution peaks around 6:00 PM (NO2: 28.5/100).
Tomorrow (22 September 2026): Air quality in Sayama, Osaka is fair. PM2.5 increases to fair; PM10 increases to fair; O3 increases to fair; all other pollutants stay as today. Pollution peaks around 6:00 PM (NO2: 31.3/100). 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 in Osaka reflects the Osaka Prefecture southeastern corridor in Osaka-Sayama city adjacent to the Kongo Mountains, with vehicle traffic on surrounding roads and the manufacturing and residential character contributing local sources. Osaka Bay breezes provide limited maritime ventilation, while the broader Kinki metropolitan regional background maintains moderate Osaka southeastern suburban readings throughout most of the year.
Today - 21 September | Pollution peaks at 18:00
AQI:
Fair
28.5/100
PM2.5 (fine particles):
Good
16.4/100
PM10 (coarse particles):
Good
12.6/100
NO2 (nitrogen dioxide):
Fair
28.5/100
O3 (ozone):
Good
18.5/100
SO2 (sulfur dioxide):
Good
9.2/100
CO (carbon monoxide):
Good
0.6/100
HCHO (formaldehyde):
Good
6.4/100
PM1 (ultrafine particles):
Fair
24.1/100
Levels show the poorest local air quality during the day
Tomorrow - 22 September | Pollution peaks at 18:00
AQI:
Fair
31.3/100
PM2.5 (fine particles):
Fair
24.8/100
PM10 (coarse particles):
Fair
21.5/100
NO2 (nitrogen dioxide):
Fair
31.3/100
O3 (ozone):
Fair
28.1/100
SO2 (sulfur dioxide):
Good
9.6/100
CO (carbon monoxide):
Good
0.7/100
HCHO (formaldehyde):
Good
5.0/100
PM1 (ultrafine particles):
Fair
27.2/100
Frequently Asked Questions
Is air quality bad in Sayama, Osaka right now?
On 21 September 2026, overall air quality in Sayama, Osaka is fair. AQI is the main air quality indicator at 28.5/100. Pollution peaks around 6:00 PM (NO2: 28.5/100).
Will air quality be worse tomorrow in Sayama, Osaka?
On 22 September 2026, air quality conditions in Sayama, Osaka will be similar to today, with AQI forecast at fair at 31.3/100. Pollution peaks around 6:00 PM (NO2: 31.3/100).
When is air pollution at its worst in Sayama, Osaka?
In Sayama, road traffic and light manufacturing are the main local sources, with conditions worsening when maritime winds die down. Onshore breezes usually help clear the air, but pollution can build up when winds are light. This coastal advantage is less pronounced during still, high-pressure weather.
Are air quality levels in Sayama, Osaka 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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