Younger North Americans are exposed to more radon gas due to occupancy biases within the residential built environment.

Sci Rep · 2021 · PMC7990966 · PMID 33762674

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a clear trendno p-value reported

There was a clear trend wherein the newest properties had the highest radon and also the greatest number of occupants of the youngest overall ages.

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Quoted from the open-access full text in Europe PMC under the licence the publisher applied. The sentence is reproduced exactly as published; the emphasis is ours.