It is the position of the National Association of School Nurses (NASN) that to protect and promote the health of all children, robust environmental health protections must be in place, and the inequities that lead to environmental injustice must be eliminated. The environment is a powerful social determinant of health and a critical factor in our children's development, academic performance, and future socioeconomic status. The registered professional school nurse (hereinafter referred to as school nurse) assesses for environmental health hazards, implements and coordinates individual health and social interventions, and addresses social determinants of health based on the National Association of School Nurses (NASN) "Framework for 21st Century School Nursing™" (NASN, 2016), to positively influence children's environmental health (Campbell & Anderko, 2020). This document provides the background and rationale for NASN's position. [This position statement was initially adopted in January 2014 and was revised in June 2018 and January 2021.]