Clarifications on Background noise

This is my first attempt at this credit. I am confused on the effort to prove background noise whether using the ASHRAE or ANSI standard. Do you just have to prove background noise from the mechanical systems serving that specific space? Surely they want you to take into account more than that, but the recommended TAP program doesn't input outside noise (i.e. traffic, adjacent spaces, etc.) or adjacent equipment and spaces. In reality, if you have a heat pump in a classroom and one in each surrounding space all and traffic outdoors, all of these are going to contribute to background noise not just the unit in the space, but you don't have to show that. Is that correct?