Worst air pollution Nagasaki, today and tomorrow
Today (10 August): Air quality in Nagasaki is fair. AQI and O3 are fair; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 7:00 PM (O3: 23.9/100).
Tomorrow (11 August 2026): Air quality in Nagasaki is poor. AQI worsens to poor; O3 increases to poor; all other pollutants stay as today. Pollution peaks around 4:00 PM (O3: 62.7/100). 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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Nagasaki's air quality benefits from its exceptional Nagasaki Bay and East China Sea coastal position in Kyushu, with consistent East China Sea and Tsushima Strait maritime breezes providing reliable ventilation. Vehicle traffic on surrounding roads and the shipbuilding, tourism, and services corridor contribute local sources, while the outstanding coastal exposure and the dramatic hillside topography create distinctive local wind patterns and Nagasaki generally maintains good to moderate conditions for a major Japanese historical coastal city throughout most of the year.
Today - 10 August | Pollution peaks at 19:00
AQI:
Fair
23.9/100
PM2.5 (fine particles):
Good
7.1/100
PM10 (coarse particles):
Good
2.4/100
NO2 (nitrogen dioxide):
Good
8.7/100
O3 (ozone):
Fair
23.9/100
SO2 (sulfur dioxide):
Good
5.9/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
6.6/100
PM1 (ultrafine particles):
Good
6.9/100
Levels show the poorest local air quality during the day
Tomorrow - 11 August | Pollution peaks at 16:00
AQI:
Poor
62.7/100
PM2.5 (fine particles):
Good
9.9/100
PM10 (coarse particles):
Good
3.6/100
NO2 (nitrogen dioxide):
Good
7.5/100
O3 (ozone):
Poor
62.7/100
SO2 (sulfur dioxide):
Good
6.0/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
7.8/100
PM1 (ultrafine particles):
Good
7.6/100
Frequently Asked Questions
Is air quality bad in Nagasaki right now?
On 10 August 2026, overall air quality in Nagasaki is fair. AQI is the main air quality indicator at 23.9/100. Pollution peaks around 7:00 PM (O3: 23.9/100).
Will air quality be worse tomorrow in Nagasaki?
On 11 August 2026, air quality conditions in Nagasaki will be worse than today, with AQI forecast at poor at 62.7/100. Pollution peaks around 4:00 PM (O3: 62.7/100).
When is air pollution at its worst in Nagasaki?
The biggest local contributors to pollution in Nagasaki are traffic emissions, harbour and shipping traffic, together with tourism-related traffic, particularly once maritime winds die down. Maritime airflow normally ventilates the area well, though calmer spells let levels rise. Areas further inland without this ventilation tend to fare worse.
Are air quality levels in Nagasaki 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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