@Article{egusphere-2026-3299,
AUTHOR = {Li, Y. and Zong, Z. and Wang, X. and Shi, X. and Sun, Z. and Cheng, Z. and Zhang, Z. and Yin, X. and Lou, Z. and Sun, R. and Kallenborn, R. and Tian, C.},
TITLE = {Decadal transition of PM$_{2.5}$ source structure over North China: Weakening combustion and emerging nitrate-driven pollution},
JOURNAL = {EGUsphere},
VOLUME = {2026},
YEAR = {2026},
PAGES = {1--18},
URL = {https://egusphere.copernicus.org/preprints/2026/egusphere-2026-3299/},
DOI = {10.5194/egusphere-2026-3299}
}