What does effective mitigation often require regarding testing devices?

Effective mitigation often requires the use of NRPP approved devices because these devices undergo rigorous testing and evaluation to ensure their reliability and accuracy in measuring radon levels. Approving devices provides assurance that they meet the required standards for performance and reporting, which is critical in effectively addressing radon exposure in homes and buildings. Using devices that are recognized by the National Radon Proficiency Program ensures that the mitigation process is based on credible data, allowing for better-informed decisions about radon exposure reduction strategies.

In contrast, home-made devices may lack the necessary accuracy and reliability, and the latest technology is not always requisite for effective mitigation. Additionally, devices with the lowest purchase price may not provide accurate readings or last long enough to be effective, making cost considerations less important than the quality and approval status of the equipment used in testing.