Worst air pollution Koshigaya, today and tomorrow
Today (16 July): Air quality in Koshigaya is poor. AQI and O3 are poor; NO2 and PM1 are fair; PM2.5, PM10, SO2, CO, and HCHO are good. Pollution peaks around 1:00 PM (O3: 72.9/100).
Tomorrow (17 July 2026): Air quality in Koshigaya is fair. AQI improves to fair; PM2.5 increases to fair; O3 decreases to fair; SO2 increases to fair; all other pollutants stay as today. Pollution peaks around 10:00 AM (NO2: 31.1/100). Airmine updates local air quality forecasts four times daily.
For long term forecasts and maps, see the Airmine app
Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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Koshigaya's air quality reflects the flat Saitama Motoara River plain adjacent to Tokyo, with vehicle traffic on surrounding expressways and the manufacturing, logistics, and residential corridor contributing local sources. The flat Kanto Plain allows reasonable dispersal, while the broader Tokyo metropolitan regional emissions elevate background and summer photochemical ozone from the vast Kanto corridor is the primary warm-season concern and Koshigaya generally maintains moderate Tokyo northern Saitama suburban readings throughout most of the year.
Today - 16 July | Pollution peaks at 13:00
AQI:
Poor
72.9/100
PM2.5 (fine particles):
Good
19.9/100
PM10 (coarse particles):
Good
5.6/100
NO2 (nitrogen dioxide):
Fair
22.5/100
O3 (ozone):
Poor
72.9/100
SO2 (sulfur dioxide):
Good
16.7/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
10.7/100
PM1 (ultrafine particles):
Fair
24.4/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 10:00
AQI:
Fair
31.1/100
PM2.5 (fine particles):
Fair
20.2/100
PM10 (coarse particles):
Good
5.4/100
NO2 (nitrogen dioxide):
Fair
31.1/100
O3 (ozone):
Fair
30.9/100
SO2 (sulfur dioxide):
Fair
25.0/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
10.7/100
PM1 (ultrafine particles):
Fair
26.0/100
Frequently Asked Questions
Is air quality bad in Koshigaya right now?
On 16 July 2026, overall air quality in Koshigaya is poor. AQI is the main air quality indicator at 72.9/100. Pollution peaks around 1:00 PM (O3: 72.9/100).
Will air quality be worse tomorrow in Koshigaya?
On 17 July 2026, air quality conditions in Koshigaya will be better than today, with AQI forecast at fair at 31.1/100. Pollution peaks around 10:00 AM (NO2: 31.1/100).
When is air pollution at its worst in Koshigaya?
In Koshigaya, traffic emissions, heavy industry such as steel, cement, or petrochemical processing, and manufacturing activity are the main local sources, with conditions worsening when summer heat and strong sunlight build up. Photochemical reactions in the heat push ozone levels higher. Cooler temperatures for the rest of the year keep this in check.
Are air quality levels in Koshigaya 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