The "ACTRIS Science Conference 2024 - Book of Abstracts" compiles 282 accepted abstracts, categorized across five scientific themes. These themes include: Theme 1 focusing on long-term trends and variability of atmospheric composition, Theme 2 explores atmospheric processes and aerosol-cloud-climate interactions, Theme 3 examines extreme events such as heat waves and forest fires in a changing climate, Theme 4 showcases innovative technologies for atmospheric probing and satellite mission validation, and Theme 5 addresses atmospheric pollution and health impacts, including urban air quality studies. This publication serves as a comprehensive resource highlighting diverse research contributions and advancements in atmospheric sciences.