Consult our section on Remodeling Your Home? Have You Considered Indoor Air Quality? at www.epa.gov/iaq/homes/hip-front.html
While remodeling or improving the energy efficiency of your home, steps should be taken to minimize pollution from sources inside the home, either from new materials, or from disturbing materials already in the home. In addition, residents should be alert to signs of inadequate ventilation, such as stuffy air, moisture condensation on cold surfaces, or mold and mildew growth. These issues should be addressed either before or during the remodeling process.
For a discussion of basic indoor air quality in homes and how it can affect your health, see EPA's The Inside Story: A Guide to Indoor Air Quality (EPA 402-K-93-007).