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Radon gas is colorless, odorless, tasteless and dangerous. The gas seeps out of the earth and floats up into the atmosphere, usually without hurting anyone. If a house or building is in the way, the gas seeps in and builds up. If too much radon gets into the building, people get sick. Because you cannot see, smell, or taste radon gas, some people install radon gas detectors in their homes and businesses. Why would a radon gas detector be helpful?
Because you cannot see, smell, or taste radon gas you will not know if there is a leak which is why a detector would be helpful.