Political Blue Sky: Evidence from the Local Annual “Two Sessions” in China

During politically sensitive periods, Chinese governments tend to take urgent administrative measures to control air pollution creating the temporary political blue sky. This empirical study uses the case of local "two sessions", one of the most politically sensitive periods in localities and examines the daily air quality index (AQI) as well as concentration data of air pollution components, including PM2.5, PM10, SO₂, CO, NO₂ and O₃ of 319 cities in China from November 2013 to June 2018. Results show that AQI decreases by approximately 4.5% during local “two sessions” periods compared to non- “two sessions” periods. Air quality improvements are mainly reflected in visible pollutants such as PM2.5, PM10 and SO₂. The mitigation of NO₂ and O₃, which is not observable by public, is not significant. In addition, the empirical results indicate that air quality deteriorates dramatically after the "two sessions". Therefore, the political blue sky comes with the price of catching up pollution that occurs after the political events.