Worst air pollution Matsumoto, today and tomorrow
Today (10 August): Air quality in Matsumoto is fair. AQI and O3 are fair; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 4:00 PM (O3: 31.7/100).
Tomorrow (11 August 2026): Air quality in Matsumoto is fair. All pollutants stay as today. Pollution peaks around 10:00 AM (O3: 30.7/100). 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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Matsumoto's air quality reflects the Nagano Prefecture Matsumoto Basin's partial enclosure between the Northern and Central Japanese Alps at 610 metres, with vehicle traffic on surrounding roads and the precision machinery, optics — Matsumoto being Japan's optical instrument capital — and tourism corridor contributing local sources. The surrounding Japanese Alps create dramatic topographic enclosure, while winter temperature inversions in the mountain basin create seasonal challenges and summer conditions are excellent with clean alpine westerly airflows throughout the warmer months.
Today - 10 August | Pollution peaks at 16:00
AQI:
Fair
31.7/100
PM2.5 (fine particles):
Good
4.2/100
PM10 (coarse particles):
Good
1.4/100
NO2 (nitrogen dioxide):
Good
6.0/100
O3 (ozone):
Fair
31.7/100
SO2 (sulfur dioxide):
Good
1.8/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
9.1/100
PM1 (ultrafine particles):
Good
5.8/100
Levels show the poorest local air quality during the day
Tomorrow - 11 August | Pollution peaks at 10:00
AQI:
Fair
30.7/100
PM2.5 (fine particles):
Good
3.5/100
PM10 (coarse particles):
Good
1.2/100
NO2 (nitrogen dioxide):
Good
4.3/100
O3 (ozone):
Fair
30.7/100
SO2 (sulfur dioxide):
Good
1.2/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
5.3/100
PM1 (ultrafine particles):
Good
3.7/100
Frequently Asked Questions
Is air quality bad in Matsumoto right now?
On 10 August 2026, overall air quality in Matsumoto is fair. AQI is the main air quality indicator at 31.7/100. Pollution peaks around 4:00 PM (O3: 31.7/100).
Will air quality be worse tomorrow in Matsumoto?
On 11 August 2026, air quality conditions in Matsumoto will be similar to today, with AQI forecast at fair at 30.7/100. Pollution peaks around 10:00 AM (O3: 30.7/100).
When is air pollution at its worst in Matsumoto?
Matsumoto usually sees its poorest air quality when traffic on the surrounding roads along with seasonal tourism traffic coincide with periods when temperature inversions set in over the valley. The bowl-like terrain here limits how quickly pollutants can escape. This tends to happen most in winter, when inversions are most common.
Are air quality levels in Matsumoto 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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