Pima Association of Governments’ Environmental Planning Division is advancing awareness of and regional solutions to long-standing and emerging environmental challenges. The emphasis is on coordinating efforts with PAG’s member jurisdictions to ensure that regional environmental concerns have a forum for debate and to consider approaches for future action. Regional sustainability is a key concern given the surrounding desert environment and the region's rapid growth and development.

Pima Association of Governments' Watershed Planning program conducts planning and coordination on various water-related topics, such as helping local municipalities and other interested parties comply with stormwater regulations and conducting hydrologic research on Cienega Creek.

The Air Quality Planning program conducts research and planning activities for air pollutants and greenhouse gases, and provides technical support for regional transportation planning to ensure compliance with air quality standards.

The Environmental Planning Advisory Committee (EPAC) oversees the activities of the Environmental Planning Division.