fig1
Figure 1. The temporal trends of the total atmospheric concentration of BaPeq for the 15 PAHs in Harbin City during the five-year period for the total phase (gas phase + particle phase) (A), particle phase (B), and gas phase (C) (Note: Solid line represents harmonic regression fitting line; dashed line represents time trend), and the contributions of each PAHs to the total concentration of BaPeq (D).
