There are a few reasons why higher floors might have fewer bugs.
First, pests tend to congregate near the ground, where there is more food and moisture.
Second, taller buildings tend to have better ventilation than shorter ones, which can help prevent infestations.
Finally, higher floors are often cleaner and less cluttered than lower ones, making them less appealing to pests.
Of course, these factors will vary from building to building, but overall, higher floors tend to be less hospitable to pests.