Read the local ordinance and contact your local Representative. You need documentation, preferably from a professional who can testify if needed.
The ordinance for exterior noise, M.G.L. Chapter 111, Section 142A-M, reads as follows:
A noise source will be considered to be violating the Department’s noise regulation (310 CMR 7.10) if the source:
1. Increases the broadband sound level by more than 10dB(A) above ambient, or
2. Produce a “puretone” condition – when any octave band center frequency sound pressure level exceeds the two adjacent center frequency sound pressure levels by 3 decibels or more.
These criteria are measured both at the property line and at the nearest inhabited residence. “Ambient” is defined as the background A-weighted sound level that is exceeded 90% of the time, measured during equipment operating hours. “Ambient” may also be established by other means with consent of the Department.
Massachusetts Noise Code Per Town And City