Precipitation chemistry is the study of the composition and chemical properties of precipitation, including rain, snow, sleet, and hail. This field of research focuses on understanding the sources and patterns of pollutants in precipitation, as well as their impacts on the environment, ecosystems, and human health. Precipitation chemistry also examines the processes that influence the formation and transport of pollutants in the atmosphere, such as atmospheric deposition, acid rain, and the interaction of pollutants with water droplets in clouds. Researchers in this area use a variety of analytical techniques to measure the concentration of various chemicals and pollutants in precipitation samples, and to assess their potential environmental and health impacts.