Worst air pollution Matsumoto, today and tomorrow
Today (16 July): Air quality in Matsumoto is fair. PM1 is fair; AQI and O3 are medium; PM2.5, PM10, NO2, SO2, CO, and HCHO are good. Pollution peaks around 12:00 PM (O3: 45.3/100).
Tomorrow (17 July 2026): Air quality in Matsumoto is medium. PM1 decreases to good; all other pollutants stay as today. Pollution peaks around 1:00 PM (O3: 53.2/100). Airmine updates local air quality forecasts four times daily.
For long term forecasts and maps, see the Airmine app
Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
Use our Strava plugin to check your own exposure.
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 - 16 July | Pollution peaks at 12:00
AQI:
Medium
45.3/100
PM2.5 (fine particles):
Good
17.2/100
PM10 (coarse particles):
Good
4.9/100
NO2 (nitrogen dioxide):
Good
17.2/100
O3 (ozone):
Medium
45.3/100
SO2 (sulfur dioxide):
Good
4.4/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
13.9/100
PM1 (ultrafine particles):
Fair
21.7/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 13:00
AQI:
Medium
53.2/100
PM2.5 (fine particles):
Good
8.9/100
PM10 (coarse particles):
Good
2.4/100
NO2 (nitrogen dioxide):
Good
10.2/100
O3 (ozone):
Medium
53.2/100
SO2 (sulfur dioxide):
Good
3.1/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
14.2/100
PM1 (ultrafine particles):
Good
12.2/100
Frequently Asked Questions
Is air quality bad in Matsumoto right now?
On 16 July 2026, overall air quality in Matsumoto is fair. PM1 is the main pollutant at 21.7/100. Pollution peaks around 12:00 PM (O3: 45.3/100).
Will air quality be worse tomorrow in Matsumoto?
On 17 July 2026, air quality conditions in Matsumoto will be better than today, with AQI forecast at medium at 53.2/100. Pollution peaks around 1:00 PM (O3: 53.2/100).
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.
Check air quality in other popular cities:
Data provided by Airmine — Last update: 16 July 2026 at 10:33 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.
For long term forecasts and maps, see the Airmine app