When the air flow passes over these contaminants they become scattered throughout the facility. It's no wonder people are becoming more and more effected by the indoor air they breathe. The quality of the air in today's office building is probably a lot worse than we realize. In fact, the people who measure such things say that the quality of indoor air in commercial buildings can easily be more polluted than the air outside. Concern for fuel economy in the early 1970s led to changes in construction techniques and building design to prevent the loss of temperature-controlled air from buildings.
Airtight structures keep air inside, but they also prevent the flow of fresh air from the outside.
The World Health Organization estimates that at least 30 percent of all modern buildings have some form of indoor air pollution. In the last ten years little has been done to eliminate the problem. Indoor air pollutants are affecting the health of office workers more today than ever before. To save energy, newer buildings are tightly sealed to reduce drafts and recirculate the stale interior air, resulting in less fresh air supply. The concentrations of the air contaminants continue to build up on top of themselves, thus the air inside is more contaminated than ever before.