Worst air pollution Yonezawa, today and tomorrow
Today (16 July): Air quality in Yonezawa is fair. HCHO is fair; AQI and O3 are medium; PM2.5, PM10, NO2, SO2, CO, and PM1 are good. Pollution peaks around 2:00 PM (O3: 40.1/100).
Tomorrow (17 July 2026): Air quality in Yonezawa is fair. AQI worsens to fair; O3 increases to fair; all other pollutants stay as today. Pollution peaks around 12:00 PM (O3: 38.6/100). 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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Yonezawa's air quality reflects the Yamagata Prefecture Yonezawa Basin's partial enclosure between the Iide and Azuma mountain ranges at 240 metres, with vehicle traffic on surrounding roads and the traditional Yonezawa beef, silk weaving, and manufacturing corridor contributing distinctive agricultural and textile aerosols alongside primary vehicle sources. The basin's topographic enclosure creates concentration under winter inversions with heavy snowfall, while the Yonezawa wagyu operations' distinctive agricultural emissions represent a locally notable air quality characteristic throughout the year.
Today - 16 July | Pollution peaks at 14:00
AQI:
Medium
40.1/100
PM2.5 (fine particles):
Good
11.8/100
PM10 (coarse particles):
Good
3.2/100
NO2 (nitrogen dioxide):
Good
13.3/100
O3 (ozone):
Medium
40.1/100
SO2 (sulfur dioxide):
Good
2.0/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Fair
21.6/100
PM1 (ultrafine particles):
Good
16.1/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 12:00
AQI:
Fair
38.6/100
PM2.5 (fine particles):
Good
12.7/100
PM10 (coarse particles):
Good
3.5/100
NO2 (nitrogen dioxide):
Good
13.8/100
O3 (ozone):
Fair
38.6/100
SO2 (sulfur dioxide):
Good
2.5/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Fair
22.2/100
PM1 (ultrafine particles):
Good
17.4/100
Frequently Asked Questions
Is air quality bad in Yonezawa right now?
On 16 July 2026, overall air quality in Yonezawa is fair. HCHO is the main pollutant at 21.6/100. Pollution peaks around 2:00 PM (O3: 40.1/100).
Will air quality be worse tomorrow in Yonezawa?
On 17 July 2026, air quality conditions in Yonezawa will be similar to today, with AQI forecast at fair at 38.6/100. Pollution peaks around 12:00 PM (O3: 38.6/100).
When is air pollution at its worst in Yonezawa?
Yonezawa usually sees its poorest air quality when vehicle traffic, manufacturing and food processing, as well as agricultural burning coincide with periods when temperature inversions set in over the valley. Topographic enclosure in the valley lets pollution accumulate rather than clear out. This tends to happen most in winter, when inversions are most common.
Are air quality levels in Yonezawa 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