In September 2021, the Office of Air and Radiation (OAR) offered the opportunity for national, state, local, and Tribal air, public health, and radiation associations to provide early input to inform the development of the OAR National Program Guidance (NPG) for FY 2023-2024 via letters of invitation. OAR received four sets of comments and shared that input with its offices and other national program offices, where relevant.