1. If the Commission finds that:
(a) The location, character or extent of particular concentrations of population or sources of air contaminant;
(b) Geographic, topographic or meteorological considerations; or
(c) Any combination of these factors,
Ê makes impracticable the maintenance of appropriate levels of air quality without an areawide air pollution control program, it shall after a public hearing define the area so affected.
2. If an areawide air pollution control program is not established by cooperative or interlocal agreement within a time specified by the Commission, the Commission shall establish such a program, which shall be a charge on the counties, and may supersede any local program within the area.