United States
Air quality in San Jose is acceptable. Consider reducing intensity or duration.
Data from Open-Meteo • Updated 12:52:18 PM
San Jose sits in the Santa Clara Valley where pollutants can accumulate, especially during temperature inversions. The Bay Area's air quality is generally good but wildfire smoke has become an increasing seasonal concern. Tech industry commuter traffic contributes to ozone formation during warmer months.
Get your Training Conditions Score, analyze your route segment by segment, and find the best time to train.
Try it freeSan Jose typically sees AQI readings between 30 and 60. Wildfire smoke events can spike readings above 150. Winter inversions occasionally trap particulate matter, raising PM2.5 levels.
Morning runs are best, particularly along trails in Alum Rock Park or the Guadalupe River Trail. Check for wildfire smoke advisories during late summer and early fall.
Deep dive into pollutants, thresholds, and how air quality affects your running performance.
Quick threshold lookup for every AQI level. Know when to run and when to stay indoors.
Practical rules for training during smoke events: when to go indoors and how to recover.