On Friday, March 8, Caltech hosted the 30th annual Informal Symposium on Kinetics and Photochemical Processes in the Atmosphere. The conference fosters collaborations between research communities and air pollution management agencies in Southern California. More than 150 participants from a broad spectrum of research areas including Atmospheric Chemistry, Environmental Sciences, Physics, Engineering, Earth System Sciences, Energy Sciences, and Environmental Toxicology attended. The conference featured invited talks by established scientists and poster sessions with contributions from most participants. Professors Janet Arey and Roger Atkinson were recognized at the conference for their outstanding contribution to the field of Atmospheric Chemistry.