Area sources of air pollution are relatively dispersed emissions over large areas with relatively constant source strength over space but can have very large temporal changes in their emissions. Common area sources of gaseous and particulate air pollution in the past have mainly geological origins, such as volcanoes, dust storms and wildfires. However, with the growing human influence on the earth’s system processes there have been additional anthropogenic area emission sources, such as landfills, farm emissions, slurry lagoons, and so on. In this chapter we will discuss some of the common area sources and the emerging trends in their management practice, with specific focus on anthropogenic emissions.