From December 1st to 4th, 2024, Gan and Shizhen participated in the 2nd Open Annual Conference on Marine System Science, held at the Zhuhai campus of Sun Yat-sen University. Gan presented a talk titled “The Polycyclic Aromatics Continuum in Atmospheric Particles: From Black Carbon to Brown Carbon”, while Shizhen gave a presentation on “Quantification of Micro- and Nano-plastics’ Contribution to Urban Atmospheric PM2.5”. We extend our sincere gratitude to Haoyu and Professor Zou for their warm hospitality during the conference!