| Sumario: | We conduct a randomized controlled trial to evaluate the impact of training university students in Bogotá to use a smartphone app that displays real-time, location-specific air quality data. The training increased participants' acquisition of information about air quality, their knowledge about avoidance behavior, and, most important, their reported avoidance behavior. Back-of-the-envelope calculations suggest that if scaled to the entire city of Bogotá, the training could reduce premature cardiovascular, cerebrovascular, and respiratory deaths by 51%–61% a year among the additional 3%–8% of the city's population incentivized to undertake avoidance behavior, a benefit valued at US$11–$13 million.
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