Worst air pollution Rose Garden San Jose - San Jose, today and tomorrow
Today (20 September): Air quality in Rose Garden San Jose is fair. AQI, PM2.5, PM10, and O3 are fair; NO2, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 11:00 PM (O3: 39.5/100).
Tomorrow (21 September 2026): Air quality in Rose Garden San Jose is moderate. AQI worsens to moderate; O3 increases to moderate; all other pollutants stay as today. Pollution peaks around 1:00 AM (O3: 40.8/100). Airmine updates local air quality forecasts four times daily.
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San Jose's Rose Garden air quality reflects the historic residential neighbourhood, with vehicle traffic on Naglee Avenue and the surrounding tree-lined residential character contributing modest local sources. The neighbourhood's exceptional tree canopy provides natural filtration, while the Bay Delta breeze provides afternoon ventilation and Rose Garden generally maintains among San Jose's more pleasant inner residential environments throughout most of the year.
Today - 20 September | Pollution peaks at 23:00
AQI:
Fair
39.5/100
PM2.5 (fine particles):
Fair
30.5/100
PM10 (coarse particles):
Fair
21.4/100
NO2 (nitrogen dioxide):
Good
2.0/100
O3 (ozone):
Fair
39.5/100
SO2 (sulfur dioxide):
Good
0.5/100
CO (carbon monoxide):
Good
0.5/100
HCHO (formaldehyde):
Good
1.2/100
PM1 (ultrafine particles):
Good
15.1/100
Levels show the poorest local air quality during the day
Tomorrow - 21 September | Pollution peaks at 01:00
AQI:
Moderate
40.8/100
PM2.5 (fine particles):
Fair
31.3/100
PM10 (coarse particles):
Fair
21.6/100
NO2 (nitrogen dioxide):
Good
2.4/100
O3 (ozone):
Moderate
40.8/100
SO2 (sulfur dioxide):
Good
0.4/100
CO (carbon monoxide):
Good
0.5/100
HCHO (formaldehyde):
Good
1.1/100
PM1 (ultrafine particles):
Good
13.6/100
Other Landmarks in San Jose
Sports venues in San Jose
Frequently Asked Questions
Is air quality bad in Rose Garden San Jose right now?
On 20 September 2026, overall air quality in Rose Garden San Jose is fair. AQI is the main air quality indicator at 39.5/100. Pollution peaks around 11:00 PM (O3: 39.5/100).
Will air quality be worse tomorrow in Rose Garden San Jose?
On 21 September 2026, air quality conditions in Rose Garden San Jose will be worse than today, with AQI forecast at moderate at 40.8/100. Pollution peaks around 1:00 AM (O3: 40.8/100).
When is air pollution at its worst in Rose Garden San Jose?
Air quality at Rose Garden San Jose shifts across the year. In short, the rainy winter months generally bring the cleanest air, as storms clear traffic and woodsmoke pollution, whereas the long dry stretch from midsummer into autumn brings both ozone and wildfire smoke risk. Wine country and inland valley locations tend to see more smoke buildup than the immediate coast.
Are air quality levels in Rose Garden 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.
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: 20 September 2026 at 14:33 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.
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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