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Q.Where can I obtain information about radon gas, its effects, and what products will prevent emissions from coming up through slab foundations?

A. The best place to start is the Environmental Protection Agency's Radon Mitigation Standards website at www.epa.gov/radon/pubs/mitstds.html. There you'll find links to a wide range of useful information, including a searchable index, radon publications, radon hotlines, radon myths and facts, and a good collection of other radon links. The EPA also provides you with directions for finding a qualified radon service professional in your area (www.epa.gov/radon/proficiency.html). Since the EPA shut down its National Radon Proficiency Program (RPP) in 1998, it also provides contacts for every state at www.epa.gov/iaq/whereyoulive.html.

Paul Fisette is director of Building Materials and Wood Technology at the University of Massachusetts at Amherst and a contributing editor to The Journal of Light Construction