[Distribution Characteristics and Source Analysis of Carbonaceous Aerosols Before and After the Spring Festival in the Guanzhong Plain].

The spatio-temporal variation characteristics and potential sources of carbonaceous aerosols in the Guanzhong Plain during the Spring Festival in 2023 were analyzed using inverse distance weighting spatial interpolation （IDW）, secondary organic carbon （SOC） estimation, and potential source contribution factor analysis （PSCF）, with the OC and EC in the PM of five cities： Xi'an, Baoji, Xianyang, Weinan, and Tongchuan as the research objects. The results showed that in terms of time distribution, （OC） was as follows： after the Spring Festival [（18.6 ±11.