Worst air pollution Tendō, today and tomorrow
Today (21 September): Air quality in Tendō is good. AQI, PM2.5, PM10, NO2, O3, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 6:00 PM (NO2: 18.3/100).
Tomorrow (22 September 2026): Air quality in Tendō is fair. AQI worsens to fair; NO2 increases to fair; O3 increases to fair; PM1 increases to fair; all other pollutants stay as today. Pollution peaks around 2:00 PM (O3: 26.7/100). 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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Tendō's air quality reflects the Yamagata Prefecture Mogami River valley position, with vehicle traffic on surrounding roads and the shogi chess piece manufacturing — Tendō producing 95% of Japan's shogi pieces — and agricultural corridor contributing distinctive wood processing emissions alongside primary vehicle sources. Sea of Japan maritime breezes provide background ventilation, while the shogi manufacturing's distinctive wooden lacquer and paint emissions represent Tendō's most locally unique craft air quality characteristic throughout the year.
Today - 21 September | Pollution peaks at 18:00
AQI:
Good
18.3/100
PM2.5 (fine particles):
Good
6.0/100
PM10 (coarse particles):
Good
3.7/100
NO2 (nitrogen dioxide):
Good
18.3/100
O3 (ozone):
Good
13.1/100
SO2 (sulfur dioxide):
Good
3.3/100
CO (carbon monoxide):
Good
0.6/100
HCHO (formaldehyde):
Good
4.6/100
PM1 (ultrafine particles):
Good
12.1/100
Levels show the poorest local air quality during the day
Tomorrow - 22 September | Pollution peaks at 14:00
AQI:
Fair
26.7/100
PM2.5 (fine particles):
Good
15.2/100
PM10 (coarse particles):
Good
11.3/100
NO2 (nitrogen dioxide):
Fair
21.4/100
O3 (ozone):
Fair
26.7/100
SO2 (sulfur dioxide):
Good
1.0/100
CO (carbon monoxide):
Good
0.8/100
HCHO (formaldehyde):
Good
6.7/100
PM1 (ultrafine particles):
Fair
24.9/100
Frequently Asked Questions
Is air quality bad in Tendō right now?
On 21 September 2026, overall air quality in Tendō is good. AQI is the main air quality indicator at 18.3/100. Pollution peaks around 6:00 PM (NO2: 18.3/100).
Will air quality be worse tomorrow in Tendō?
On 22 September 2026, air quality conditions in Tendō will be worse than today, with AQI forecast at fair at 26.7/100. Pollution peaks around 2:00 PM (O3: 26.7/100).
When is air pollution at its worst in Tendō?
Air quality in Tendō tends to be worse when road traffic, manufacturing activity, and agricultural activity build up and the sea breeze weakens. Sea breezes typically keep conditions in check, except during still weather. This natural ventilation is one reason coastal areas often see better readings than inland cities.
Are air quality levels in Tendō 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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