LIVE CAM
![Current northward view from Caltech Hall.](https://caltech-hall.library.caltech.edu/north.jpg)
18 AQI
Current O3 concentration 19.9 ppbv
56 AQI
Current PM2.5 concentration 14 μg/m³
Unusually sensitive people should consider reducing prolonged or heavy exertion.
36 AQI
Current PM10 concentration 34.6 μg/m³
4 AQI
Current CO concentration 327.7 ppbv
19 AQI
Current NO2 concentration 19.9 ppbv