By: Maria M Hernandez, LEED AP

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January is the month of resolutions, when people resolve to become better, but also is the National Radon Action Month: Federal Action Plan that aims to reach out to millions of homes, schools and daycare facilities to educate and save lives. As a Green building professional and Indoor airPLUS verifier, I invite you to add a New Year resolution to your list by testing your home for Radon, to ensure the safety and health of your loves ones.

Radon is a potential health hazard, cancer-causing, radioactive gas. You can’t see it, smell it or taste it; it is an invisible killer that could be present in your home. This radioactive gas comes from the natural breakdown of uranium in soil, rock and water and gets into the air you breathe. It typically moves up through the ground to the air above and into your home through cracks and other holes in the foundation and also through the water supply.

Radon gas decays into radioactive particles that can get trapped in your lungs when you breathe. As they break down further, these particles release small bursts of energy. This can damage lung tissue and lead to lung cancer over the course of your lifetime. According to the Environmental Protection Agency, radon is the number one cause of lung cancer among non-smokers. Overall, radon is the second leading cause of lung cancer, responsible for about 21,000 deaths every year.

Data collected by the EPA indicates that 1 in 5 Florida residences have elevated radon levels. The only way to know the levels in your home is by testing. This process is easy, inexpensive and should only take a few minutes and you can do it yourself. The EPA recommends all homeowners test their residences for radon gas concentrations. There are two kits available: short (2 to 90 days) and long-term (more than 90 days) available through the mail and in hardware stores. EPA recommends taking the short test first, if your result is 4 pCi/L or higher, takes the long-term test or a second short-term test. You can also hire a trained contractor to do the testing for you.

Picocuries per liter (pCi/L) is a unit for measuring radioactive concentrations.The average indoor radon level is estimated to be about 1.3 pCi/L, and about 0.4 pCi/L of radon is normally found in the outside air. If the result you got on the test is 4pCi/L or higher, you have to fix the home. Levels less than 4 pCi/L still pose a risk, and in many cases, may be reduced to 2 pCi/L or below.

Radon mitigation requires technical knowledge and special skills to achieve the maximum indoor air quality and performance. Selecting the best approach depends on the design of your home and other factors. In South Florida, most of radon mitigation is performed by a fixed rate of mechanical ventilation. Some of this mitigation doesn’t address problems associated with high indoor humidity, mold, or health consequences. I highly recommend hiring a qualified Green building contractor to help you pick the right treatment method based on building science and moisture management technology.

If you are selling a home that already has a radon reduction system installed, make sure, you inform your potential buyers about the system’s operation and maintenance. If you are buying and existing house, remember to request the radon test and if you are looking to build or buy a new house, I highly recommend buying a house approved with radon- resistant features or certified under the programs: LEED, FGBC, ENERGY STAR, and Indoor airPLUS. For more information, visit: or you can send me an email to:


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