Academic paper presentation for Airports, Air pollution and Contemporaneous Health for Wolfram Schlenker and W. Reed Walker. We link daily air pollution exposure to measures of contemporaneous health for communities surrounding the twelve largest airports in California. Excess airplane idling, measured as residual daily taxi time, is due to network delays originating in the Eastern US. This idiosyncratic variation in daily airplane taxi time significantly impacts the health of local residents, largely driven by increased levels of carbon monoxide (CO) exposure. We use this variation in daily airport congestion to estimate the population dose-response of health outcomes to daily CO exposure, examining hospitalization rates for asthma, respiratory, and heart-related emergency room admissions.