The occupants also need to understand some of the technical constraints that would be involved in keeping the building operating while the problem is being solved. For example, it is often not possible to isolate one area of the building from another without extensive renovation. Therefore, polluting activities in one portion of the building which create problems in other places may only be resolved if changes are made in work practices, by relocation of the activities, or by rebuilding the ventilation system. These choices are usually too expensive and complex to be made by the building manager alone, so the options must be presented clearly to those with the power to make effective decisions. Resolution of the Problem Determining when an IAQ problem is solved can be difficult.
Many problems end only when the people who are affected by the problem leave the work place.
In order to minimize the chances of a recurrence of the IAQ problem, it is important to make whatever improvements are found to be warranted by the investigation. Even after a particular problem has been solved, IAQ will require continued management for the long term. Because of the expense of IAQ problems, both in terms of the costs of investigating them and the loss of productive work time, it is important to manage a building with an eye to preventing IAQ issues. Success depends on carefully assessing the ventilation system for adequacy, and maintaining it as designed or respecified after a change in building use. Key components in maintaining a healthy building are careful selection of the filters and regular changing of them.