Condensation Particle Counting Technology and Its Applications introduces the principles, key components, calibration methods, and applications of condensation particle counting systems. This book delves into the adverse effects of fine particles on human health, along with the existing detection technologies for these particles. It discusses the theories and methods of optical measurement for fine particles and elaborates on the applicable conditions for each light scattering theory, providing a theoretical foundation for detecting particle-scattered light. This book concludes with an overview of the challenges posed by ongoing climate change and future research prospects in condensation particle counting (CPC). This book is intended for industry professionals and environmental researchers specializing in particle and aerosol measurement, detection methods, and technology.