The optimum humidity in offices
In many cases dry air problems can be dealt with in general by directly humidifying the handling unit. This way, you will be assured of the freshly blown air directly having the right percentage of humidity in a responsible manner, energy wise.
In case there is no air handling unit present, we can look at a different approach. For instance, the area could be humidified directly, or we can install a simple ventilation system above the ceiling.