marginally significantP < 0.10
Additionally, in the heating season, the GMs of BbFA, BkFA, BaP, DahA, and Σ10-PAHs in school B were higher than those in school A by 38%, 47%, 26%, 26%, and 39%, respectively ( P < 0.05), with a marginally significant difference between schools for FLA, CHR, BaA, DghiP, and IcdP ( P < 0.10).