The processes of new particle formation (NPF) and growth are important contributors to cloud condensation nuclei (CCN) concentrations, and CCN are important for climate from their impact on planetary radiative forcing. While the general ubiquity and importance of NPF is v • I would also like to extend the greatest appreciation to my advisor, Jeffrey Pierce, for his well-rounded support, affirmation, motivation, and patience throughout this project. I am consistently reminded of Jeff's enthusiasm and depth of knowledge about aerosol microphysics, and I have always appreciated our conversations about science and life in general.