Home sick home: indoor air quality issues

In Florida, where we utilize air conditioning to cool occupants and de-humidify the air, builders are encouraged to build tight homes. Many people assume that energy efficient homes that are tightly built are more likely to increase indoor air pollution than homes that are deliberately leaky. However, properly designed and maintained homes reduce the likelihood that pollutants will enter the home and they are able to remove the pollutants (moisture, cooking odors, etc.) that enter by using controlled ventilation. The problem with a "leaky" home is that you have no way to control the air that enters through the cracks and spaces. What are the pollutants? Contaminants can come from insid