Radon was recognized as a potential public health threat in the United States more than 30 years ago. To understand and effectively deal with radon, one needs to understand the physics of radon, its health effects, measurement techniques and protocols, the extent of its occurrence in the United States, mitigation principles and practices, and legislative and regulatory actions.

Manual 15 addresses these areas and provides a well-rounded look at the radon issue. Ten peer-reviewed chapters include:

• Radon -- A Multifaceted Environmental Problem: An Overview

• Radon and the Natural Environment

• Health Effects of Radon

• Measurement Methods and Instrumentation

• Radon Measurement Protocols

• Geology and Occurrence

• Concentration Patterns

• Radon Control Strategies

• EPA's Strategy to Reduce Risk of Radon

• Current and Future Perspectives.