The following Standard is intended to provide construction/design requirements for reducing interior noise/sound levels for all new construction occurring within the Noise Control Districts (NCD) identified in the City of Tucson Unified Development Code for the Tucson International Airport (TIA) and Davis-Monthan (DM) Airport Environs Zone. The following Standard may be applied to construction outside the TIA and DM Airport Environs Zone as determined by the Building Official.