Worst air pollution Kosai, today and tomorrow
Today (16 July): Air quality in Kosai is very poor. AQI and O3 are very poor; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 3:00 PM (O3: 82.8/100).
Tomorrow (17 July 2026): Air quality in Kosai is fair. AQI improves to medium; O3 decreases to medium; PM1 increases to fair; all other pollutants stay as today. Pollution peaks around 10:00 AM (O3: 48.0/100). 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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Kosai's air quality reflects the Shizuoka Prefecture Hamana Lake coastal position, with vehicle traffic on surrounding roads and the manufacturing, automotive parts, and services corridor contributing local sources. Consistent Pacific and Enshunada Bay maritime breezes provide coastal ventilation, while summer photochemical ozone from the broader Shizuoka corridor is the primary warm-season concern and Kosai generally maintains moderate to good conditions for a Shizuoka coastal city throughout most of the year.
Today - 16 July | Pollution peaks at 15:00
AQI:
Very poor
82.8/100
PM2.5 (fine particles):
Good
15.1/100
PM10 (coarse particles):
Good
4.5/100
NO2 (nitrogen dioxide):
Good
12.7/100
O3 (ozone):
Very poor
82.8/100
SO2 (sulfur dioxide):
Good
6.2/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
8.3/100
PM1 (ultrafine particles):
Good
18.2/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 10:00
AQI:
Medium
48.0/100
PM2.5 (fine particles):
Good
16.7/100
PM10 (coarse particles):
Good
4.7/100
NO2 (nitrogen dioxide):
Good
13.7/100
O3 (ozone):
Medium
48.0/100
SO2 (sulfur dioxide):
Good
3.4/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
12.6/100
PM1 (ultrafine particles):
Fair
21.4/100
Frequently Asked Questions
Is air quality bad in Kosai right now?
On 16 July 2026, overall air quality in Kosai is very poor. AQI is the main air quality indicator at 82.8/100. Pollution peaks around 3:00 PM (O3: 82.8/100).
Will air quality be worse tomorrow in Kosai?
On 17 July 2026, air quality conditions in Kosai will be better than today, with PM1 forecast at fair at 21.4/100. Pollution peaks around 10:00 AM (O3: 48.0/100).
When is air pollution at its worst in Kosai?
Pollution in Kosai typically rises when traffic on the surrounding roads, steel, cement, and chemical production, together with manufacturing and food processing combine, especially once warm, sunny weather takes hold. Strong sunlight reacting with local emissions drives up ground-level ozone. Maritime airflow normally ventilates the area well, though calmer spells let levels rise.
Are air quality levels in Kosai 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