Worst air pollution Tosu, today and tomorrow
Today (21 September): Air quality in Tosu is fair. AQI, PM2.5, and O3 are fair; PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 2:00 PM (O3: 35.3/100).
Tomorrow (22 September 2026): Air quality in Tosu is moderate. AQI worsens to moderate; PM10 increases to fair; NO2 increases to fair; O3 increases to moderate; all other pollutants stay as today. Pollution peaks around 3:00 PM (O3: 49.4/100). 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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Tosu's air quality reflects the Saga Prefecture northern Kyushu Chikugo River plain position adjacent to the Tosu Premium Outlets highway interchange, with vehicle traffic on surrounding roads and the logistics, automotive parts, and manufacturing corridor contributing local sources. Consistent Ariake Sea maritime breezes provide background ventilation, while transboundary Chinese and Korean industrial pollution on westerly winds is the primary regional background concern and Tosu generally maintains moderate Fukuoka-Saga metropolitan corridor readings throughout most of the year.
Today - 21 September | Pollution peaks at 14:00
AQI:
Fair
35.3/100
PM2.5 (fine particles):
Fair
23.8/100
PM10 (coarse particles):
Good
19.1/100
NO2 (nitrogen dioxide):
Good
15.5/100
O3 (ozone):
Fair
35.3/100
SO2 (sulfur dioxide):
Good
3.5/100
CO (carbon monoxide):
Good
0.7/100
HCHO (formaldehyde):
Good
4.7/100
PM1 (ultrafine particles):
Good
7.1/100
Levels show the poorest local air quality during the day
Tomorrow - 22 September | Pollution peaks at 15:00
AQI:
Moderate
49.4/100
PM2.5 (fine particles):
Fair
30.9/100
PM10 (coarse particles):
Fair
23.1/100
NO2 (nitrogen dioxide):
Fair
23.5/100
O3 (ozone):
Moderate
49.4/100
SO2 (sulfur dioxide):
Good
4.9/100
CO (carbon monoxide):
Good
0.9/100
HCHO (formaldehyde):
Good
6.7/100
PM1 (ultrafine particles):
Good
14.2/100
Frequently Asked Questions
Is air quality bad in Tosu right now?
On 21 September 2026, overall air quality in Tosu is fair. AQI is the main air quality indicator at 35.3/100. Pollution peaks around 2:00 PM (O3: 35.3/100).
Will air quality be worse tomorrow in Tosu?
On 22 September 2026, air quality conditions in Tosu will be worse than today, with AQI forecast at moderate at 49.4/100. Pollution peaks around 3:00 PM (O3: 49.4/100).
When is air pollution at its worst in Tosu?
Air quality in Tosu tends to be worse when road traffic as well as light manufacturing build up and dry spells bring strong winds. 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 Tosu 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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