Environmental epidemiology is a branch of epidemiology that focuses on studying the relationship between environmental exposures and human health outcomes. It seeks to understand how various environmental factors such as air and water quality, chemicals, radiation, and climate change impact public health. Environmental epidemiologists investigate how exposure to these factors can lead to diseases or conditions in populations. They collect and analyze data from populations exposed to different environmental factors to assess the potential health risks and inform public health policies and interventions aimed at reducing those risks. By conducting studies and analyzing data, environmental epidemiologists aim to identify patterns and associations between environmental exposures and health outcomes to better understand and address health risks related to the environment.