What Causes Differences in PM2.5 Concentration in China? Structures are more Important . The Economics and Finance Letters, [S. l.], v. 9, n. 1, p. 28–39, 2022. DOI: 10.18488/29.v9i1.2936. Disponível em: https://archive.conscientiabeam.com/index.php/29/article/view/2936. Acesso em: 13 aug. 2026.