Song, Yan Does the expansion of the joint prevention and control area improve the air quality?-Evidence from China's Jing-Jin-Ji region and surrounding areas. [electronic resource] - The Science of the total environment Mar 2020 - 136034 p. digital Publication Type: Journal Article ISSN: 1879-1026 Standard No.: 10.1016/j.scitotenv.2019.136034 doi