LIVE CAM
![Current northward view from Caltech Hall.](https://caltech-hall.library.caltech.edu/north.jpg)
17 AQI
Current O3 concentration 22.6 ppbv
52 AQI
Current PM2.5 concentration 10.1 μg/m³
Unusually sensitive people should consider reducing prolonged or heavy exertion.
21 AQI
Current PM10 concentration 16.9 μg/m³
4 AQI
Current CO concentration 293 ppbv
17 AQI
Current NO2 concentration 15.2 ppbv