Which preposition to use with unwholesomeness

of Occurrences 10%

One word as to the unwholesomeness of new bread and hot rolls.

in Occurrences 1%

The exhalations from ripe fruit, or withering leaves, are proved much to injure the air in which they are confined; and, it is probable, all those vegetables which emit a strong scent may do this in a greater or less degree, from the Rose to the Lobelia; whence the unwholesomeness in living perpetually in such an atmosphere of perfume as some people wear about their hair, or carry in their handkerchiefs.

Which preposition to use with  unwholesomeness