Internal Documents Prove Tobacco Industry Aware of Second-Hand Smoke Risks, Researchers Say. Internal documents show the tobacco industry knew about but consistently failed to warn people about the health risks from second-hand smoke.

Comprehensive article on radon. Radon progeny, the decay chain and radiation. Lung cancer risks. Occupational and residential limits. Geographic radon potential. Waterborne radon. (June 1999)

Provides certification and continuing education classes that meet National Radon Proficiency Program. Located in Colorado Springs, CO.

California EPA report on secondhand smoke. Extremely detailed and documented. OEHHA protects public health and the environment by scientific evaluation of risks posed by hazardous substances.

Short primer on U238 decay through radon to stable lead, radioactive half times of elements. Chart of the decay chain with half times and alpha or beta radiation.

Report from the Washington Post. Most scientific studies in recent years support the point: Breathing someone else's tobacco smoke can hurt one's health.

U.S. Geological Survey site on radon in earth, air and water. Site resources include educational information on radon, and multiple maps on the geologic and geographic occurrence of radon in the United States.

Educates consumers on the health effects of radon, radon testing, and mitigation. From the Consumer Federation of America Foundation.

A radon mitigation company servicing Cincinnati OH, Northern Kentucky and Indiana. This site features a look at various systems, seals & fans pictures - flash and sound!

Basement waterproofing, radon mitigation, concrete crack repair, concrete cleaning and D-I-Y basement repairs made easy! RadonSeal deep-penetrating concrete sealer stops water seepage, vapor, molds and even radon permanently.