Worst air pollution Japantown San Jose - San Jose, today and tomorrow
Today (15 July): Air quality in Japantown San Jose is medium. AQI and O3 are medium; PM2.5, PM10, NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 9:00 AM (O3: 45.8/100).
Tomorrow (16 July 2026): Air quality in Japantown San Jose is fair. PM2.5 increases to fair; all other pollutants stay as today. Pollution peaks around 9:00 AM (O3: 44.7/100). 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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San Jose's Japantown air quality reflects the historic cultural neighbourhood, with vehicle traffic on Jackson Street and the surrounding mixed residential and commercial character contributing local sources. The Bay Delta breeze provides afternoon ventilation, while the neighbourhood's walkable character and the community's cultural heritage generally maintain moderate San Jose metropolitan readings throughout most of the year.
Today - 15 July | Pollution peaks at 09:00
AQI:
Medium
45.8/100
PM2.5 (fine particles):
Good
16.0/100
PM10 (coarse particles):
Good
10.0/100
NO2 (nitrogen dioxide):
Good
11.1/100
O3 (ozone):
Medium
45.8/100
SO2 (sulfur dioxide):
Good
3.5/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.6/100
PM1 (ultrafine particles):
Good
9.8/100
Levels show the poorest local air quality during the day
Tomorrow - 16 July | Pollution peaks at 09:00
AQI:
Medium
44.7/100
PM2.5 (fine particles):
Fair
20.7/100
PM10 (coarse particles):
Good
10.4/100
NO2 (nitrogen dioxide):
Good
18.3/100
O3 (ozone):
Medium
44.7/100
SO2 (sulfur dioxide):
Good
3.3/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.2/100
PM1 (ultrafine particles):
Good
13.3/100
Other Landmarks in San Jose
Sports venues in San Jose
Frequently Asked Questions
Is air quality bad in Japantown San Jose right now?
On 15 July 2026, overall air quality in Japantown San Jose is medium. AQI is the main air quality indicator at 45.8/100. Pollution peaks around 9:00 AM (O3: 45.8/100).
Will air quality be worse tomorrow in Japantown San Jose?
On 16 July 2026, air quality conditions in Japantown San Jose will be worse than today, with PM2.5 forecast at fair at 20.7/100. Pollution peaks around 9:00 AM (O3: 44.7/100).
When is air pollution at its worst in Japantown San Jose?
Japantown San Jose's air quality follows a clear seasonal pattern. In short, winter storms periodically reset air quality, keeping the cleanest stretch to the rainy months, whereas heat and dryness combine from July onward to raise both ozone and smoke risk. Wine country and inland valley locations tend to see more smoke buildup than the immediate coast.
Are air quality levels in Japantown San Jose 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.
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Data provided by Airmine — Last update: 16 July 2026 at 10:33 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.
For long term forecasts and maps, see the Airmine app