 Radon is the world's second leading cause of lung cancer. This radioactive gas can be found in rocks and soil and even in people's homes. Radon can seep inside homes through cracks and openings in the lowest part of the building. When I heard about the radon level in our house, my first reaction was, I can't stay here any longer. The IAEA helps countries take action to reduce health risks caused by long-term exposure to radon. You can ask your national authorities, local authorities or radon laboratories on advice how to measure radon and reduce radon levels. In some countries like Austria, authorities help people measure the radon level. The measurement of the radon level is done by so-called radon detectors and what we do is we provide these radon detectors to the household. Measurement is the only way to determine the radon level and if the radon level is high, it is important to take action to reduce the radon level in the home. Experts can advise on how to reduce radon in buildings. Insulation is one way to prevent radon from entering houses. With the technical measures, we could reduce the level about 20 times. The IAEA provides guidelines and trainings to support countries to protect people from radon.