The Mexico City megalopolis, also known as the Megalopolis of Central Mexico (Spanish: Corona regional del centro de México), is a megalopolis containing Greater Mexico City and surrounding metropolitan areas. In 1996, the Programa General de Desarollo Urbano del Distrito Federal first proposed this concept to refer to the Mexico City megalopolis, or "Megalopolis of central Mexico", which was later expanded by PROAIRE, a metropolitan commission on the environment.