Worst air pollution Isahaya, today and tomorrow
Today (16 July): Air quality in Isahaya is medium. AQI and O3 are medium; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 3:00 PM (O3: 50.5/100).
Tomorrow (17 July 2026): Air quality in Isahaya is fair. AQI worsens to fair; O3 increases to fair; all other pollutants stay as today. Pollution peaks around 12:00 PM (O3: 39.6/100). 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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Isahaya's air quality reflects the Nagasaki Prefecture Isahaya Bay coastal position adjacent to the controversial Isahaya Bay tidal flat reclamation, with vehicle traffic on surrounding roads and the manufacturing, agricultural, and services corridor contributing local sources. Consistent Ariake Sea and East China Sea maritime breezes provide coastal ventilation, while the outstanding coastal exposure generally maintains Isahaya among Nagasaki Prefecture's more moderately ventilated coastal cities throughout most of the year.
Today - 16 July | Pollution peaks at 15:00
AQI:
Medium
50.5/100
PM2.5 (fine particles):
Good
8.9/100
PM10 (coarse particles):
Good
3.2/100
NO2 (nitrogen dioxide):
Good
0.8/100
O3 (ozone):
Medium
50.5/100
SO2 (sulfur dioxide):
Good
0.7/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
4.2/100
PM1 (ultrafine particles):
Good
7.0/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 12:00
AQI:
Fair
39.6/100
PM2.5 (fine particles):
Good
10.5/100
PM10 (coarse particles):
Good
3.6/100
NO2 (nitrogen dioxide):
Good
0.9/100
O3 (ozone):
Fair
39.6/100
SO2 (sulfur dioxide):
Good
0.6/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
4.5/100
PM1 (ultrafine particles):
Good
9.4/100
Frequently Asked Questions
Is air quality bad in Isahaya right now?
On 16 July 2026, overall air quality in Isahaya is medium. AQI is the main air quality indicator at 50.5/100. Pollution peaks around 3:00 PM (O3: 50.5/100).
Will air quality be worse tomorrow in Isahaya?
On 17 July 2026, air quality conditions in Isahaya will be worse than today, with AQI forecast at fair at 39.6/100. Pollution peaks around 12:00 PM (O3: 39.6/100).
When is air pollution at its worst in Isahaya?
Air quality in Isahaya tends to be worse when traffic on the surrounding roads, manufacturing and food processing, together with agricultural activity build up and maritime winds die down. Onshore breezes usually help clear the air, but pollution can build up when winds are light. This natural ventilation is one reason coastal areas often see better readings than inland cities.
Are air quality levels in Isahaya 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