Worst air pollution Tōkamachi, today and tomorrow
Today (16 July): Air quality in Tōkamachi is fair. HCHO is fair; AQI and O3 are medium; PM2.5, PM10, NO2, SO2, CO, and PM1 are good. Pollution peaks around 1:00 PM (O3: 54.4/100).
Tomorrow (17 July 2026): Air quality in Tōkamachi is medium. HCHO decreases to good; all other pollutants stay as today. Pollution peaks around 2:00 PM (O3: 53.6/100). 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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Tōkamachi's air quality reflects the Niigata Prefecture Shinano River valley's partial enclosure between the Echigo and Mikuni mountains at 252 metres, with vehicle traffic on surrounding roads and the traditional Tōkamachi kimono textile, snow country tourism, and agricultural corridor contributing local sources. The deep Echigo mountain valley creates significant topographic enclosure under the famous Tōkamachi heavy snowfall inversions, while the kimono dyeing operations' distinctive chemical emissions represent the most locally unique air quality contribution.
Today - 16 July | Pollution peaks at 13:00
AQI:
Medium
54.4/100
PM2.5 (fine particles):
Good
9.5/100
PM10 (coarse particles):
Good
2.8/100
NO2 (nitrogen dioxide):
Good
10.5/100
O3 (ozone):
Medium
54.4/100
SO2 (sulfur dioxide):
Good
2.7/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Fair
20.9/100
PM1 (ultrafine particles):
Good
11.8/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 14:00
AQI:
Medium
53.6/100
PM2.5 (fine particles):
Good
8.1/100
PM10 (coarse particles):
Good
2.3/100
NO2 (nitrogen dioxide):
Good
9.6/100
O3 (ozone):
Medium
53.6/100
SO2 (sulfur dioxide):
Good
2.9/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
18.3/100
PM1 (ultrafine particles):
Good
10.8/100
Frequently Asked Questions
Is air quality bad in Tōkamachi right now?
On 16 July 2026, overall air quality in Tōkamachi is fair. HCHO is the main pollutant at 20.9/100. Pollution peaks around 1:00 PM (O3: 54.4/100).
Will air quality be worse tomorrow in Tōkamachi?
On 17 July 2026, air quality conditions in Tōkamachi will be better than today, with AQI forecast at medium at 53.6/100. Pollution peaks around 2:00 PM (O3: 53.6/100).
When is air pollution at its worst in Tōkamachi?
Air quality in Tōkamachi tends to be worse when traffic on the surrounding roads, heavy industrial and chemical processing, together with light manufacturing build up and calm, stagnant conditions settle in the surrounding valley. Topographic enclosure in the valley lets pollution accumulate rather than clear out. This is most pronounced in winter, when inversions are more frequent.
Are air quality levels in Tōkamachi 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.
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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