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The concentration of radon in the air has been measured in the 700 m-deepYangyang underground laboratory between October 2004 and May 2022. The averageconcentrations in two experimental areas, called A6 and A5, were measured to be53.4$\pm$0.2 Bq/m3 and 33.5$\pm$0.1 Bq/m3, respectively. The lower value in theA5 area reflects the presence of better temperature control and ventilation.The radon concentrations sampled within the two A5 experimental rooms' air arefound to be correlated to the local surface temperature outside of the rooms,with correlation coefficients r = 0.22 and r = 0.70. Therefore, the radonconcentrations display a seasonal variation, because the local temperaturedriven by the overground season influences air ventilation in the experimentalareas. A fit on the annual residual concentrations finds that the amplitudeoccurs each year on August, 31$\pm$6 days.

Radon concentration variations at the Yangyang underground laboratory