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Radon Exposure – How does it happen? Radon exposure risks apply when a person inhales considerable amounts of radon over a long period of time. Radon levels in the home, office, school, or other confined structures can be low or high. We spend the majority of our time at home. Radon can infiltrate your home through gaps in the foundation, floor cracks, or wall cracks. As soon as the toxic gas enters the home, it gets strapped inside and accumulates to dangerous levels. Irrespective of the structure, radon exposure can happen in any home. Surprisingly, radon levels rise to a dangerous level in an insulated home, which is built on the soil containing uranium, thorium, and radium. Radon experts in the United States quantify the gas in pCi/L, and anything above 4 pCi/L is considered dangerous. According to estimates, 1 out of every 15 homes has higher radon levels. So, there is a possibility that your home may also have higher levels. Radon concentrations are often highest in the basement or on the lowest floor of a house.