I don't see it mentioned here, but I wonder if the trees around the apartment are transpiring the vocs that are absorbed from the (potentially) contaminated wat

I don't see it mentioned here, but I wonder if the trees around the apartment are transpiring the vocs that are absorbed from the (potentially) contaminated water. That would be a way these vocs reach her 3rd floor apt, and also may be why her particular apartment is affected more than others.in the building (proximity to a particular tree?)