The City Administrator shall cause to be posted prominently "No Smoking" signs, with letters of not less than one-half (½) inch in height or the international "No Smoking" symbol consisting of a pictorial representation of a burning cigarette enclosed in a red circle with a bar across it, in every place where smoking is prohibited by this Section. In instances where smoking may be permitted in some areas within a location, the sign may contain the following wording "EXCEPT IN DESIGNATED AREAS", which lettering shall not be less than one-half (½) inch in height.