Recent revelations about the impact of air pollution on human health are troubling, yet air pollution and the risks it poses are largely invisible because federally mandated monitoring stations are sparse. William Griswold explains the CitiSense system, developed at UC San Diego, which leverages the proliferation of smart phones and the advent of cheap, compact sensors to enable real-time monitoring of air quality. By sharing all users' data through the cloud, CitiSense can create a regional air-quality map and predict air pollution for those not carrying a sensor. Griswold is presented as part of UC San Diego Founders Symposium 2014. Recorded on 11/13/2014. (#29032)