A Zoning Ordinance regulating and restricting the height, location, size and use of buildings and/or land in the City of Clairton, Allegheny County, Pennsylvania, the areas to be occupied by buildings in proportion to the size of the lots upon which they stand: the size of yards and other open spaces appurtenant thereto and the density of population, and for these purposes establishing districts and boundaries, and other uses within such districts and boundaries, and providing for the appointment of a Zoning Hearing Board, and setting forth the duties and functions of said Board, and providing for administration, charges and enforcement of this chapter and providing penalties for violation thereof.