Testing indoor radon involves using short-term or long-term kits to measure levels over time. Short-term tests, such as charcoal canisters or alpha particle detectors, require 2–7 days of placement in high-traffic areas. Long-term tests, like alpha track detectors, recommend 90-day placements for more accurate results. The Environmental Protection Agency (EPA) advises that homes with radon levels exceeding 4 pCi/L should prioritize mitigation, typically via sub-slab depressurization systems. Proactive testing is critical because radon is the second leading cause of lung cancer in the United States, responsible for approximately 21,000 annual deaths, according to the EPA’s 2023 report. High radon exposure correlates with increased mortality rates, particularly in regions with geological formations like granite or uranium-rich soils, which emit higher radon concentrations. The EPA estimates that 6.9 million U.S. homes have radon levels above the action threshold, underscoring the need for widespread testing. Mitigation reduces radon levels by 80–99%, significantly lowering health risks. Regular testing is recommended every 2–3 years, especially after major home renovations that alter airflow patterns. Public health campaigns, such as the EPA’s Radon Action Month in January, emphasize testing as a cost-effective preventive measure. Studies published in Environmental Health Perspectives (2022) found that homes with radon mitigation systems had 40–60% lower lung cancer incidence compared to untreated homes. In summary, adherence to EPA guidelines ensures accurate detection and effective mitigation, directly reducing long-term health risks tied to radon exposure.