Worst air pollution Minamiuonuma, today and tomorrow
Today (16 July): Air quality in Minamiuonuma 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 Minamiuonuma 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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Minamiuonuma's air quality benefits from its exceptional Niigata Prefecture Uono River valley position at 340 metres adjacent to the famous Koshihikari rice and Niigata sake corridor, with consistent Sea of Japan maritime breezes and mountain valley winds providing reliable ventilation. Vehicle traffic on surrounding roads and the premium rice and sake brewing corridor contribute local sources, while the sake fermentation's distinctive yeast emissions represent the most locally fragrant air quality characteristic throughout the year.
Today - 16 July | Pollution peaks at 13:00
AQI:
Medium
54.4/100
PM2.5 (fine particles):
Good
10.7/100
PM10 (coarse particles):
Good
3.2/100
NO2 (nitrogen dioxide):
Good
19.4/100
O3 (ozone):
Medium
54.4/100
SO2 (sulfur dioxide):
Good
4.9/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Fair
20.9/100
PM1 (ultrafine particles):
Good
13.3/100
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
9.1/100
PM10 (coarse particles):
Good
2.5/100
NO2 (nitrogen dioxide):
Good
17.8/100
O3 (ozone):
Medium
53.6/100
SO2 (sulfur dioxide):
Good
5.3/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
18.3/100
PM1 (ultrafine particles):
Good
12.2/100
Frequently Asked Questions
Is air quality bad in Minamiuonuma right now?
On 16 July 2026, overall air quality in Minamiuonuma 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 Minamiuonuma?
On 17 July 2026, air quality conditions in Minamiuonuma 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 Minamiuonuma?
The biggest local contributor to pollution in Minamiuonuma is traffic on the surrounding roads, particularly once maritime winds die down. Onshore breezes usually help clear the air, but pollution can build up when winds are light. This coastal advantage is less pronounced during still, high-pressure weather.
Are air quality levels in Minamiuonuma 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