Supplement of Source Apportionment and Driving Mechanisms of Black Carbon in a Mountainous Megacity: Insights from Urban–Suburban Observations in Chongqing, China

Supplementary information (SI): two tables and nineteen figures. Table S1 provides a global comparison of black carbon concentrations in megacities. Table S2 provides GuoYuan Port cargo throughput data. Fig. S1–S19 present detailed supplementary statistical analyses including box plots, polar plots, wind roses, scatter plots, and seasonal correlation matrices of eBC components, co-pollutants, meteorological parameters, and emission comparisons across all study sites.