Worst air pollution Annaka, today and tomorrow
Today (16 July): Air quality in Annaka is poor. AQI and O3 are poor; PM2.5, NO2, and SO2 are fair; PM1 is medium; PM10, CO, and HCHO are good. Pollution peaks around 1:00 PM (O3: 60.1/100).
Tomorrow (17 July 2026): Air quality in Annaka is fair. AQI improves to medium; PM2.5 decreases to good; O3 decreases to medium; SO2 decreases to good; HCHO increases to fair; PM1 decreases to good; all other pollutants stay as today. Pollution peaks around 4:00 PM (O3: 48.4/100). 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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Annaka's air quality reflects the Gunma Prefecture Usui River valley position at the Karuizawa highland gateway, with vehicle traffic on surrounding roads and the manufacturing, pharmaceutical, and mountain gateway character contributing local sources. The surrounding Usui and Myogi mountain ranges create topographic variation, while summer photochemical ozone from the Kanto corridor and the clean Karuizawa highland breezes create a distinctive contrast and Annaka generally maintains moderate to good Japanese Gunma mountain gateway readings throughout most of the year.
Today - 16 July | Pollution peaks at 13:00
AQI:
Poor
60.1/100
PM2.5 (fine particles):
Fair
36.4/100
PM10 (coarse particles):
Good
10.4/100
NO2 (nitrogen dioxide):
Fair
27.2/100
O3 (ozone):
Poor
60.1/100
SO2 (sulfur dioxide):
Fair
24.7/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
14.6/100
PM1 (ultrafine particles):
Medium
40.9/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 16:00
AQI:
Medium
48.4/100
PM2.5 (fine particles):
Good
9.7/100
PM10 (coarse particles):
Good
2.6/100
NO2 (nitrogen dioxide):
Fair
28.9/100
O3 (ozone):
Medium
48.4/100
SO2 (sulfur dioxide):
Good
18.2/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Fair
20.7/100
PM1 (ultrafine particles):
Good
13.5/100
Frequently Asked Questions
Is air quality bad in Annaka right now?
On 16 July 2026, overall air quality in Annaka is poor. AQI is the main air quality indicator at 60.1/100. Pollution peaks around 1:00 PM (O3: 60.1/100).
Will air quality be worse tomorrow in Annaka?
On 17 July 2026, air quality conditions in Annaka will be better than today, with NO2 forecast at fair at 28.9/100. Pollution peaks around 4:00 PM (O3: 48.4/100).
When is air pollution at its worst in Annaka?
Annaka usually sees its poorest air quality when traffic emissions, petrochemical and refining operations, together with manufacturing and food processing coincide with periods when warm, sunny weather takes hold. Strong sunlight reacting with local emissions drives up ground-level ozone. Cooler temperatures for the rest of the year keep this in check.
Are air quality levels in Annaka 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