Emissions of gases and other pollutants from human activities are critical drivers of phenomena such as climate change, stratospheric ozone depletion, degradation of air quality in urban and rural areas, long-range transport of air pollution, and changes in aerosol and cloud physical properties. To understand these impacts it is necessary to make atmospheric measurements of chemical composition and physical parameters, and to interpret these observations with a range of statistical, conceptual, and computer-based models. In this module you will be introduced to a range of modern atmospheric measurements techniques, both those used in the field and in the laboratory. Consideration will be given to the relevant chemical and physical processes that are required to understand these observations. You will also learn about a range of interpretive techniques including numerical models, and you will put some of these in to practice. Co-taught with ENV-3A80. It is recommended that students have previously taken ENV-MA37. TO TAKE THIS MODULE YOU CANNOT HAVE PREVIOUSLY TAKEN ENV-3A80 OR EQUIVALENT