Worst air pollution Annaka, today and tomorrow
Today (10 August): Air quality in Annaka is fair. AQI, NO2, and O3 are fair; PM2.5, PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 9:00 PM (NO2: 32.9/100).
Tomorrow (11 August 2026): Air quality in Annaka is fair. All pollutants stay as today. Pollution peaks around 11:00 AM (O3: 32.5/100). 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 - 10 August | Pollution peaks at 21:00
AQI:
Fair
32.9/100
PM2.5 (fine particles):
Good
9.4/100
PM10 (coarse particles):
Good
2.7/100
NO2 (nitrogen dioxide):
Fair
32.9/100
O3 (ozone):
Fair
32.4/100
SO2 (sulfur dioxide):
Good
8.0/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
14.9/100
PM1 (ultrafine particles):
Good
12.1/100
Levels show the poorest local air quality during the day
Tomorrow - 11 August | Pollution peaks at 11:00
AQI:
Fair
32.5/100
PM2.5 (fine particles):
Good
7.4/100
PM10 (coarse particles):
Good
2.2/100
NO2 (nitrogen dioxide):
Fair
20.4/100
O3 (ozone):
Fair
32.5/100
SO2 (sulfur dioxide):
Good
5.2/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
10.7/100
PM1 (ultrafine particles):
Good
9.2/100
Frequently Asked Questions
Is air quality bad in Annaka right now?
On 10 August 2026, overall air quality in Annaka is fair. AQI is the main air quality indicator at 32.9/100. Pollution peaks around 9:00 PM (NO2: 32.9/100).
Will air quality be worse tomorrow in Annaka?
On 11 August 2026, air quality conditions in Annaka will be similar to today, with AQI forecast at fair at 32.5/100. Pollution peaks around 11:00 AM (O3: 32.5/100).
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.
Why doesn’t the forecast always reflect wildfire impacts?
Airmine’s forecast uses CAMS (Copernicus Atmosphere Monitoring Service) as its background atmospheric model. While CAMS includes wildfire emissions, these are derived from satellite observations and are not available in real time. During rapidly evolving wildfire events, there may therefore be a delay before increased emissions are incorporated into the model. As a result, the forecast may temporarily underestimate PM₂.₅ and other pollutants associated with wildfire smoke.
During rapidly evolving wildfire events, CAMS may lag by approximately 1–2 days before increased wildfire emissions are fully represented, which can lead to temporary underestimation of PM₂.₅ concentrations in Airmine’s forecast.
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Data provided by Airmine — Last update: 9 August 2026 at 20:27 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.
Disclaimer: Forecasts are provided for informational purposes only and should not be relied upon as medical advice. Actual pollen and air quality conditions may vary from the forecast. If you have allergies, asthma, or another medical condition, consult a healthcare professional. Please see our Terms of Service for important information about limitations of liability.
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