3. The permitted objectives of agreements concluded pursuant to paragraph 1 shall include, inter alia, the sharing of county and city personnel, equipment and facilities, including sewerage systems, drainage systems, street lighting systems, fire detection systems, wastewater treatment plants, playgrounds, parks and recreational facilities, as well as public buildings, which are implemented by or under the supervision of the district council or municipal council of the county concerned and the municipality concerned. the city was built under the conditions and agreements and in the areas within the county that can be defined, for the promotion and protection of the health, comfort, safety, life, well-being and property of the inhabitants of the counties and cities. 1. fully set out the purposes, powers, rights, objectives and responsibilities of the parties; (e) the sharing of personnel, equipment and facilities of the county and the city under conditions and in areas that may be defined, in order to promote and protect the health of the inhabitants of the county and the city, through the regulation, control and prohibition of excessive emissions of smoke and dense air pollution. (c) the joint employment of administrators, stenographers and other employees in the offices of the municipal and district auditor, the municipal and district councillor, the municipal and county treasurer or another joint office of the city and borough existing or subsequently established in the various boroughs, on such terms as may be fixed for the equitable apportionment of the expenses of the Joint Office of the City and Borough. . . .