Evolution Characteristics and Influencing Factors of Air Quality in Xining City from 2021 to 2025. Frontiers in Engineering, [S. l.], v. 1, n. 3, p. 33–48, 2026. DOI: 10.63313/FE.9015. Disponível em: https://academics.erytis.com/index.php/fe/article/view/680. Acesso em: 21 jul. 2026.