The exercise of the powers granted by this article shall be in all respects for the benefit of the people of the Commonwealth, for the increase of their commerce and prosperity, and for the improvement of their health and living conditions, and as the operation and maintenance of the projects by the Authority and the undertaking of activities in the furtherance of the purposes of the Authority constitutes the performance of the essential governmental functions, the Authority shall not be required to pay any taxes or assessments upon any project or any property acquired or used by the Authority under the provisions of this article or upon the income therefrom, including sales and use taxes on the tangible personal property used in the operations of the Authority. The exemption granted in this section shall not be construed to extend to persons conducting on the premises of the facility businesses for which local or state taxes would otherwise be required. Any bonds or refunding bonds issued under the provisions of this article and any transfer of such bonds shall at all times be free from state and local taxation. The interest on the bonds and any refunding bonds or bond anticipation notes shall at all times be exempt from taxation by the Commonwealth and by any of its political subdivisions.