The central competent authority shall delineate and officially announce each class of special municipality, county and city control region based on the demands placed upon air quality by land use or air quality conditions. The central competent authority shall draw up an air pollution control scheme and shall review it every four years. Special municipality, county and city competent authorities shall determine air pollution control plans pursuant to the preceding article and the aforementioned scheme and report to the central competent authority for its approval and announcement, and shall review and amend the plans every four years.