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Using an eight-week long original survey conducted day-by-day in 2015, we leverage daily variation in air quality to estimate the causal effects of pollution on regime support. Pollution substantially increases demand for government oversight, decreases overall satisfaction at both central and local levels, and negatively affects perceptions of economic performance. Since our results reflect daily attitudinal change, they are conservative estimates of pollution's effect. Our results cast doubt on assertions that environmental problems only become politically salient when countries reach higher income levels. Additionally, because part of our survey coincides with a period during which the regime intentionally reduced air pollution, we exploit this unique experiment in authoritarian responsiveness to show that government efforts to reduce pollution do successfully improve citizen assessments of the regime. Our results causally estimate the importance of environmental challenges in developing countries and shed light on specific facets of authoritarian governance affected by pollution. [ABSTRACT FROM AUTHOR]