This paper estimates the causal impact of Democratic vs Republican governors on pollution. Using a regression discontinuity design, gubernatorial election data, and air quality data from US Environmental Protection Agency (EPA), we find that air pollution is lower under Democratic governors.

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Keywords Political parties, Pollution, Regression discontinuity
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Journal Economics Letters
Beland, L.-P., & Boucher, V. (Vincent). (2015). Polluting politics. Economics Letters, 137, 176–181. doi:10.1016/j.econlet.2015.11.007