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When performing sequential radon measurements as part of a real estate transaction one should report the results of the ,initial test to the client before proceeding with the second test.

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Final answer:

The results of the initial radon test should be reported to a client in real estate transactions before a second test is conducted, as any building can have high radon levels, and the EPA recommends action at 4 pCi/L.

Step-by-step explanation:

When performing sequential radon measurements in a real estate transaction, it is considered best practice to report the results of the initial test to the client before proceeding with the second test. This approach is recommended because any building, whether new or old, with or without basements, can have high levels of radon gas. Radon is a carcinogenic gas that can enter buildings through various ways such as cracks in floors, walls, and around pipes. The U.S. Environmental Protection Agency (EPA) advises taking action when radon levels reach or exceed 4 pCi/L due to associated health risks such as lung cancer. It is critical to inform the potential buyers or current homeowners of the initial radon levels so that they can make informed decisions regarding their health and safety.

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