Free fare for better air? Evaluating the impacts of free fare public transit on air pollution.

Due to the positive externalities of public transit, fares have been heavily subsidized throughout the United States and the world. Policymakers have designed these subsidies as a potential mechanism to reduce local air pollution. This paper evaluates the effectiveness of free-fare public transit subsidies in reducing air pollution. Studying the "Zero Fare for Better Air" initiative, I find no significant decrease in ground-level ozone due to free-fare public transit in Colorado. This paper also demonstrates how the free-fare initiative failed to improve welfare even when incorporating all the positive externalities of transit ridership. [ABSTRACT FROM AUTHOR]