governments establish the optimal city size when production processes involve environmental pollution. Our analysis delivers two … key insights. First, if an optimal scheme to regulate environmental pollution is implemented, cities chosen by local … governments are never too large. They are too small if pollution is purely global, but at the optimal size, if pollution is purely …

pollution. We assemble a rich database consisting of daily, sub-national level data of air quality for 178 countries before and …. We find the lockdowns to result in significant decreases in global air pollution. These results are consistent across … countries with a higher share of trade and manufacturing in the economy or with an initially lower level of air pollution …

pollution-linked deaths occur. We offer the first study that examines the pandemic's impacts on improving air quality in Vietnam …, a lower-middle income country with worsening air pollution. Employing the Regression Discontinuity Design method to … analyze a rich database that we compile from satellite air pollution data and data from various other sources, we find the …