Evaluating the effect of Clean Heating Policy Pilot on air quality improvement:A quasi-experimental study based on three batches of pilot cities in China
Based on the balanced panel data of 321 prefecture level cities from 2014 to 2019,the multi-period Differences-in-Differences(DID)approach was used to quantify the air pollution improvement effect of the Clean Heating Policy Pilot(CHPP)in China.The results showed that the CHPP significantly reduced air pollution and improved the air quality of pilot cities.On average,the air quality index(AQI)of the pilot cities was significantly lower than that of the non-pilot cities by 4.12;AQI,PM2.5,PM10 and SO2 decreased by about 5.49％,11.47％,12.65％and 35.66％respectively.The result remained consistent after a series of robustness tests.The internal mechanism of the CHPP to improve urban air quality was that the CHPP changed the heating energy structure of urban residents and reduced the emission of sulfide and inhalable particulate matter.Therefore,during the"14th five-year plan"period,it is recommended that the government should expand the implementation scope of CHPP,increase financial investment,promote fiscal expenditure efficiency,reduce the costs of clean energy and promote the universal adoption of clean energy.
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