Worst air pollution Chiba, today and tomorrow
Today (21 September): Air quality in Chiba is moderate. AQI and PM1 are moderate; PM2.5 and NO2 are fair; PM10, O3, SO2, CO, and HCHO are good. Pollution peaks around 7:00 AM (PM1: 42.7/100).
Tomorrow (22 September 2026): Air quality in Chiba is poor. AQI worsens to poor; PM2.5 increases to moderate; PM10 increases to fair; NO2 increases to poor; SO2 increases to fair; all other pollutants stay as today. Pollution peaks around 4:00 PM (NO2: 70.0/100). 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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Chiba's air quality reflects the Tokyo metropolitan area's southeastern industrial waterfront on Tokyo Bay, with vehicle traffic on surrounding expressways and the Chiba industrial complex's steel, oil refining, and chemical operations generating elevated industrial SO₂ and PM2.5. Tokyo Bay's limited maritime ventilation provides some coastal influence, while the extraordinary industrial waterfront scale makes Chiba Tokyo's most distinctively heavy industrial bay-side metropolitan environment and summer photochemical ozone is the primary warm-season concern throughout the year.
Today - 21 September | Pollution peaks at 07:00
AQI:
Moderate
42.7/100
PM2.5 (fine particles):
Fair
21.8/100
PM10 (coarse particles):
Good
12.7/100
NO2 (nitrogen dioxide):
Fair
30.0/100
O3 (ozone):
Good
4.9/100
SO2 (sulfur dioxide):
Good
8.5/100
CO (carbon monoxide):
Good
0.7/100
HCHO (formaldehyde):
Good
2.2/100
PM1 (ultrafine particles):
Moderate
42.7/100
Levels show the poorest local air quality during the day
Tomorrow - 22 September | Pollution peaks at 16:00
AQI:
Poor
70.0/100
PM2.5 (fine particles):
Moderate
42.4/100
PM10 (coarse particles):
Fair
24.1/100
NO2 (nitrogen dioxide):
Poor
70.0/100
O3 (ozone):
Good
7.4/100
SO2 (sulfur dioxide):
Fair
20.9/100
CO (carbon monoxide):
Good
1.3/100
HCHO (formaldehyde):
Good
6.4/100
PM1 (ultrafine particles):
Moderate
55.8/100
Frequently Asked Questions
Is air quality bad in Chiba right now?
On 21 September 2026, overall air quality in Chiba is moderate. AQI is the main air quality indicator at 42.7/100. Pollution peaks around 7:00 AM (PM1: 42.7/100).
Will air quality be worse tomorrow in Chiba?
On 22 September 2026, air quality conditions in Chiba will be worse than today, with AQI forecast at poor at 70.0/100. Pollution peaks around 4:00 PM (NO2: 70.0/100).
When is air pollution at its worst in Chiba?
Pollution in Chiba typically rises when road traffic together with heavy industrial and chemical processing combine, especially once windblown dust events occur. These wind events can carry dust in from the surrounding arid landscape. Photochemical reactions in the heat push ozone levels higher.
Are air quality levels in Chiba 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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