Worst air pollution Yoyogi Park & Harajuku - Tokyo, today and tomorrow
Today (21 September): Air quality in Yoyogi Park & Harajuku is poor. AQI and NO2 are poor; PM2.5, PM10, SO2, and PM1 are fair; O3, CO, and HCHO are good. Pollution peaks around 1:00 PM (NO2: 60.5/100).
Tomorrow (22 September 2026): Air quality in Yoyogi Park & Harajuku is very poor. AQI worsens to very poor; PM2.5 increases to moderate; PM10 increases to moderate; NO2 increases to very poor; PM1 increases to moderate; all other pollutants stay as today. Pollution peaks around 5:00 PM (NO2: 81.1/100). 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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Tokyo's Yoyogi Park and Harajuku air quality benefits from the 54-hectare former Olympic park's substantial woodland providing a natural green buffer against the surrounding Shibuya and Shinjuku commercial intensity. Vehicle traffic on the surrounding Omotesando and Harajuku arterial roads are the primary local concerns, while the park's extensive forest canopy and the adjacent Meiji Shrine's woodland generally maintain better conditions than the surrounding commercial streets throughout most of the year.
Today - 21 September | Pollution peaks at 13:00
AQI:
Poor
60.5/100
PM2.5 (fine particles):
Fair
33.2/100
PM10 (coarse particles):
Fair
28.5/100
NO2 (nitrogen dioxide):
Poor
60.5/100
O3 (ozone):
Good
10.3/100
SO2 (sulfur dioxide):
Fair
24.2/100
CO (carbon monoxide):
Good
0.9/100
HCHO (formaldehyde):
Good
5.1/100
PM1 (ultrafine particles):
Fair
35.8/100
Levels show the poorest local air quality during the day
Tomorrow - 22 September | Pollution peaks at 17:00
AQI:
Very poor
81.1/100
PM2.5 (fine particles):
Moderate
44.5/100
PM10 (coarse particles):
Moderate
42.5/100
NO2 (nitrogen dioxide):
Very poor
81.1/100
O3 (ozone):
Good
13.1/100
SO2 (sulfur dioxide):
Fair
37.8/100
CO (carbon monoxide):
Good
1.6/100
HCHO (formaldehyde):
Good
7.7/100
PM1 (ultrafine particles):
Moderate
47.8/100
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Frequently Asked Questions
Is air quality bad in Yoyogi Park & Harajuku right now?
On 21 September 2026, overall air quality in Yoyogi Park & Harajuku is poor. AQI is the main air quality indicator at 60.5/100. Pollution peaks around 1:00 PM (NO2: 60.5/100).
Will air quality be worse tomorrow in Yoyogi Park & Harajuku?
On 22 September 2026, air quality conditions in Yoyogi Park & Harajuku will be worse than today, with AQI forecast at very poor at 81.1/100. Pollution peaks around 5:00 PM (NO2: 81.1/100).
When is air pollution at its worst in Yoyogi Park & Harajuku?
In Yoyogi Park & Harajuku, reduced air quality is most noticeable when cedar and cypress pollen peaks, and on days affected by vehicle traffic on the neighbouring Omotesando and Harajuku arterial roads; beyond that, the area's natural ventilation keeps air quality consistently favourable through the months that follow.
Are air quality levels in Yoyogi Park & Harajuku 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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