Does the “Blue Sky Defense War Policy” Paint the Sky Blue?—A Case Study of Beijing–Tianjin–Hebei Region, China

Xuan Yang, Yue Wang, Di Chen, Xue Tan, Xue Tian and Lei Shi
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Xuan Yang: School of Environment and Natural Resources, Renmin University of China, Beijing 100872, China
Yue Wang: School of Environment and Natural Resources, Renmin University of China, Beijing 100872, China
Di Chen: School of Environment and Natural Resources, Renmin University of China, Beijing 100872, China
Xue Tan: Energy Strategy and Planning Research Department, State Grid Energy Research Institute Co., Ltd., Beijing 102209, China
Xue Tian: School of Environment and Natural Resources, Renmin University of China, Beijing 100872, China
Lei Shi: School of Environment and Natural Resources, Renmin University of China, Beijing 100872, China

IJERPH, 2021, vol. 18, issue 23, 1-25

Abstract: Improving air quality is an urgent task for the Beijing–Tianjin–Hebei (BTH) region in China. In 2018, utilizing 365 days’ daily concentration data of six air pollutants (including PM 2.5 , PM 10 , SO 2 , NO 2 , CO and O 3 ) at 947 air quality grid monitoring points of 13 cities in the BTH region and controlling the meteorological factors, this paper takes the implementation of the Blue Sky Defense War (BSDW) policy as a quasi-natural experiment to examine the emission reduction effect of the policy in the BTH region by applying the difference-in-difference method. Results show that the policy leads to the significant reduction of the daily average concentration of PM 2.5 , PM 10 , SO 2 , O 3 by −1.951 μg/m 3 , −3.872 μg/m 3 , −1.902 μg/m 3 , −7.882 μg/m 3 and CO by −0.014 mg/m 3 , respectively. The results of the robustness test support the aforementioned conclusions. However, this paper finds that the concentration of NO 2 increases significantly (1.865 μg/m 3 ). In winter heating seasons, the concentration of SO 2 , CO and O 3 decrease but PM 2.5 , PM 10 and NO 2 increase significantly. Besides, resource intensive cities, non-key environmental protection cities and cities in the north of the region have great potential for air pollutant emission reduction. Finally, policy suggestions are recommended; these include setting specific goals at the city level, incorporating more cities into the list of key environmental protection cities, refining the concrete indicators of domestic solid fuel, and encouraging and enforcing clean heating diffusion.

Keywords: blue sky defense war policy; monitoring point; air pollution; meteorological factors; difference-in-difference; quasi-natural experiment (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2021
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