(a) Dwellings, Etc. Dwellings and residences of any kind, including motels, trailer parks, also schools, hospitals, clinics and other institutions for human care, except where incidental to a permitted principal use; provided, that any of the aforesaid uses legally existing in the M-2 District at the time of adoption of this Zoning Ordinance or any amendment thereto, shall not be classified as a nonconforming use as defined in Section 1123
and subject to the provisions of Chapter 1161
.
(b) Offensive Uses; Not to be Authorized. No use shall be permitted or authorized to be established or maintained which, when conducted under adequate conditions and safeguards in compliance with the provisions of this Zoning Ordinance, and any additional conditions or requirements prescribed by the Board of Zoning Appeals, is or may become hazardous, noxious or offensive, due to the emission of odor, dust, smoke, cinders, gas, fumes, noise, vibration, beat frequency, refuse matter or water- carried waste.