Worst air pollution Yoshikawa, today and tomorrow
Today (21 September): Air quality in Yoshikawa is fair. AQI, NO2, and PM1 are fair; PM2.5, PM10, O3, SO2, CO, and HCHO are good. Pollution peaks around 12:00 PM (PM1: 29.4/100).
Tomorrow (22 September 2026): Air quality in Yoshikawa is moderate. AQI worsens to moderate; PM2.5 increases to fair; NO2 increases to moderate; all other pollutants stay as today. Pollution peaks around 6:00 PM (NO2: 43.3/100). 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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Yoshikawa's air quality reflects the flat Saitama Motoarakawa River plain adjacent to Tokyo, with vehicle traffic on surrounding roads and the manufacturing, residential, and commercial character contributing local sources. The flat Kanto Plain allows reasonable dispersal, while the broader Tokyo metropolitan regional emissions elevate background and summer photochemical ozone is the primary warm-season concern and Yoshikawa generally maintains moderate Tokyo northern Saitama suburban readings throughout most of the year.
Today - 21 September | Pollution peaks at 12:00
AQI:
Fair
29.4/100
PM2.5 (fine particles):
Good
18.6/100
PM10 (coarse particles):
Good
13.6/100
NO2 (nitrogen dioxide):
Fair
22.5/100
O3 (ozone):
Good
8.8/100
SO2 (sulfur dioxide):
Good
2.5/100
CO (carbon monoxide):
Good
0.7/100
HCHO (formaldehyde):
Good
7.3/100
PM1 (ultrafine particles):
Fair
29.4/100
Levels show the poorest local air quality during the day
Tomorrow - 22 September | Pollution peaks at 18:00
AQI:
Moderate
43.3/100
PM2.5 (fine particles):
Fair
21.1/100
PM10 (coarse particles):
Good
13.8/100
NO2 (nitrogen dioxide):
Moderate
43.3/100
O3 (ozone):
Good
14.0/100
SO2 (sulfur dioxide):
Good
8.6/100
CO (carbon monoxide):
Good
1.1/100
HCHO (formaldehyde):
Good
7.1/100
PM1 (ultrafine particles):
Fair
39.7/100
Frequently Asked Questions
Is air quality bad in Yoshikawa right now?
On 21 September 2026, overall air quality in Yoshikawa is fair. AQI is the main air quality indicator at 29.4/100. Pollution peaks around 12:00 PM (PM1: 29.4/100).
Will air quality be worse tomorrow in Yoshikawa?
On 22 September 2026, air quality conditions in Yoshikawa will be worse than today, with AQI forecast at moderate at 43.3/100. Pollution peaks around 6:00 PM (NO2: 43.3/100).
When is air pollution at its worst in Yoshikawa?
In Yoshikawa, traffic emissions, heavy industrial and chemical processing, along with light manufacturing are the main local sources, with conditions worsening when hot, still weather settles in. Strong sunlight reacting with local emissions drives up ground-level ozone. This is far less of an issue outside the warmer months.
Are air quality levels in Yoshikawa 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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