Worst air pollution Hirosaki, today and tomorrow
Today (21 September): Air quality in Hirosaki is fair. AQI, NO2, and PM1 are fair; PM2.5, PM10, O3, SO2, CO, and HCHO are good. Pollution peaks around 7:00 PM (NO2: 21.9/100).
Tomorrow (22 September 2026): Air quality in Hirosaki is fair. NO2 decreases to good; O3 increases to fair; all other pollutants stay as today. Pollution peaks around 1:00 PM (O3: 25.0/100). 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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Hirosaki's air quality benefits from its exceptional Aomori Prefecture Iwaki Mountain and Tsugaru Plain position, with consistent Sea of Japan and Pacific maritime breezes providing reliable ventilation. Vehicle traffic on surrounding roads and the apple farming — Hirosaki being Japan's apple capital — tourism, and manufacturing corridor contribute distinctive apple processing organic aerosols alongside primary vehicle sources, while the outstanding maritime exposure and the apple industry's seasonal organic emissions create Hirosaki's most locally distinctive air quality characteristic throughout the year.
Today - 21 September | Pollution peaks at 19:00
AQI:
Fair
21.9/100
PM2.5 (fine particles):
Good
10.2/100
PM10 (coarse particles):
Good
6.9/100
NO2 (nitrogen dioxide):
Fair
21.9/100
O3 (ozone):
Good
15.1/100
SO2 (sulfur dioxide):
Good
1.6/100
CO (carbon monoxide):
Good
0.7/100
HCHO (formaldehyde):
Good
4.9/100
PM1 (ultrafine particles):
Fair
20.1/100
Levels show the poorest local air quality during the day
Tomorrow - 22 September | Pollution peaks at 13:00
AQI:
Fair
25.0/100
PM2.5 (fine particles):
Good
13.3/100
PM10 (coarse particles):
Good
12.4/100
NO2 (nitrogen dioxide):
Good
15.9/100
O3 (ozone):
Fair
25.0/100
SO2 (sulfur dioxide):
Good
1.2/100
CO (carbon monoxide):
Good
0.8/100
HCHO (formaldehyde):
Good
5.0/100
PM1 (ultrafine particles):
Fair
23.7/100
Frequently Asked Questions
Is air quality bad in Hirosaki right now?
On 21 September 2026, overall air quality in Hirosaki is fair. AQI is the main air quality indicator at 21.9/100. Pollution peaks around 7:00 PM (NO2: 21.9/100).
Will air quality be worse tomorrow in Hirosaki?
On 22 September 2026, air quality conditions in Hirosaki will be similar to today, with AQI forecast at fair at 25.0/100. Pollution peaks around 1:00 PM (O3: 25.0/100).
When is air pollution at its worst in Hirosaki?
The biggest local contributors to pollution in Hirosaki are traffic on the surrounding roads, manufacturing and food processing, and agricultural burning, particularly once dry, windy weather picks up. Strong seasonal winds can lift dust from the surrounding dry terrain and push particulate levels sharply higher. Maritime airflow normally ventilates the area well, though calmer spells let levels rise.
Are air quality levels in Hirosaki 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: 22 September 2026 at 02:59 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.
Some text on this page may be generated or summarised using artificial intelligence (AI). Wherever possible, AI-generated content is enriched with Airmine's proprietary data to improve its accuracy and relevance. However, AI-generated content may still contain errors, omissions, or inaccuracies.
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