The 30th International Conference on Aerosol Science & Technology (ICAST) organized by the Southeast Asia Exchange Committee of the Taiwan Association for Aerosol Research (TAAR), took place on September 22-23, 2023. Asst. Prof. Dr. Weerawut Chaiwat delivered a keynote address on the topic of "Utilization of petroleum wastes and agricultural residues for the production of carbon materials towards achieving net-zero emissions." The conference was hosted at National Yang Ming Chiao Tung University in Hsinchu City, Taiwan.