Worst air pollution Saijō, today and tomorrow
Today (10 August): Air quality in Saijō is medium. AQI and O3 are medium; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 3:00 PM (O3: 40.4/100).
Tomorrow (11 August 2026): Air quality in Saijō is medium. All pollutants stay as today. Pollution peaks around 3:00 PM (O3: 46.7/100). 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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Saijō's air quality reflects the Ehime Prefecture Seto Inland Sea coastal position at the Nishiseto Expressway corridor, with vehicle traffic on surrounding roads and the semiconductor — Saijo hosting major Renesas Electronics operations — and manufacturing corridor contributing elevated industrial emissions. Consistent Seto Inland Sea maritime breezes provide coastal ventilation, while the semiconductor industrial character represents Saijo's most distinctive local emission source and the coastal position generally maintains moderate Ehime Seto Inland Sea corridor readings throughout most of the year.
Today - 10 August | Pollution peaks at 15:00
AQI:
Medium
40.4/100
PM2.5 (fine particles):
Good
6.2/100
PM10 (coarse particles):
Good
1.9/100
NO2 (nitrogen dioxide):
Good
0.3/100
O3 (ozone):
Medium
40.4/100
SO2 (sulfur dioxide):
Good
0.1/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
10.9/100
PM1 (ultrafine particles):
Good
7.7/100
Levels show the poorest local air quality during the day
Tomorrow - 11 August | Pollution peaks at 15:00
AQI:
Medium
46.7/100
PM2.5 (fine particles):
Good
7.5/100
PM10 (coarse particles):
Good
2.8/100
NO2 (nitrogen dioxide):
Good
0.3/100
O3 (ozone):
Medium
46.7/100
SO2 (sulfur dioxide):
Good
0.1/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
9.4/100
PM1 (ultrafine particles):
Good
6.0/100
Frequently Asked Questions
Is air quality bad in Saijō right now?
On 10 August 2026, overall air quality in Saijō is medium. AQI is the main air quality indicator at 40.4/100. Pollution peaks around 3:00 PM (O3: 40.4/100).
Will air quality be worse tomorrow in Saijō?
On 11 August 2026, air quality conditions in Saijō will be similar to today, with AQI forecast at medium at 46.7/100. Pollution peaks around 3:00 PM (O3: 46.7/100).
When is air pollution at its worst in Saijō?
The biggest local contributors to pollution in Saijō are road traffic as well as manufacturing activity, particularly once windblown dust events occur. Strong seasonal winds can lift dust from the surrounding dry terrain and push particulate levels sharply higher. Onshore breezes usually help clear the air, but pollution can build up when winds are light.
Are air quality levels in Saijō 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: 9 August 2026 at 20:27 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.
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