Environmental chemistry is an introduction to chemical processes that regulate the composition of air, water, and soil. Attention is paid to understanding chemical equilibrium and kinetics of natural systems and how they are influenced by human actions. Additional topics of study may include sources, effects, and remediation of pollution, green chemistry and the analysis of environmental samples. There are two courses in this field: CHEM331, a lecture based course offered every year, and CHEM332, a laboratory offered in alternate years. The laboratory is designed to introduce students to common procedures for analyzing water, air, and soil samples. Through these analyses, students also gain familiarity with important properties that environmental chemists use to characterize such samples.