Worst air pollution Chiryū, today and tomorrow
Today (21 September): Air quality in Chiryū is moderate. AQI and PM1 are moderate; PM2.5, NO2, and O3 are fair; PM10, SO2, CO, and HCHO are good. Pollution peaks around 12:00 AM (PM1: 42.0/100).
Tomorrow (22 September 2026): Air quality in Chiryū is moderate. PM10 increases to fair; NO2 increases to moderate; all other pollutants stay as today. Pollution peaks around 7:00 PM (NO2: 44.2/100). 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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Chiryū's air quality reflects the Aichi Prefecture Yahagi River plain position adjacent to Toyota City and the Tokai Junction automotive corridor, with vehicle traffic on surrounding roads and the extraordinary concentration of automotive parts manufacturing — Chiryū sitting at the heart of Toyota's global supply chain — generating elevated automotive industrial and vehicle emissions. The flat Nobi Plain allows reasonable dispersal, while summer photochemical ozone from the Chukyo corridor is the primary warm-season concern and Chiryu's automotive character makes it one of Aichi's most distinctively supply chain-defined urban environments.
Today - 21 September | Pollution peaks at 00:00
AQI:
Moderate
42.0/100
PM2.5 (fine particles):
Fair
23.9/100
PM10 (coarse particles):
Good
17.9/100
NO2 (nitrogen dioxide):
Fair
32.6/100
O3 (ozone):
Fair
24.9/100
SO2 (sulfur dioxide):
Good
5.2/100
CO (carbon monoxide):
Good
1.0/100
HCHO (formaldehyde):
Good
10.0/100
PM1 (ultrafine particles):
Moderate
42.0/100
Levels show the poorest local air quality during the day
Tomorrow - 22 September | Pollution peaks at 19:00
AQI:
Moderate
44.2/100
PM2.5 (fine particles):
Fair
26.7/100
PM10 (coarse particles):
Fair
23.7/100
NO2 (nitrogen dioxide):
Moderate
44.2/100
O3 (ozone):
Fair
34.2/100
SO2 (sulfur dioxide):
Good
8.6/100
CO (carbon monoxide):
Good
1.1/100
HCHO (formaldehyde):
Good
7.9/100
PM1 (ultrafine particles):
Moderate
41.4/100
Frequently Asked Questions
Is air quality bad in Chiryū right now?
On 21 September 2026, overall air quality in Chiryū is moderate. AQI is the main air quality indicator at 42.0/100. Pollution peaks around 12:00 AM (PM1: 42.0/100).
Will air quality be worse tomorrow in Chiryū?
On 22 September 2026, air quality conditions in Chiryū will be similar to today, with AQI forecast at moderate at 44.2/100. Pollution peaks around 7:00 PM (NO2: 44.2/100).
When is air pollution at its worst in Chiryū?
Chiryū usually sees its poorest air quality when vehicle traffic, heavy industry such as steel, cement, or petrochemical processing, along with manufacturing and food processing coincide with periods when windblown dust events occur. Strong seasonal winds can lift dust from the surrounding dry terrain and push particulate levels sharply higher. Heat and sunlight combine with emissions to form ozone at ground level.
Are air quality levels in Chiryū 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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