We report the results of six years (2013)(2014)(2015)(2016)(2017)(2018) of measurements of 222 Rn air concentration, relative humidity, atmospheric pressure and temperature in the halls A, B and C of the Canfranc Underground Laboratory (LSC). We have calculated all the Pearson correlation coefficients among these parameters and we have found a positive correlation between the 222 Rn concentration and the relative humidity. Both correlated variables show a seasonal periodicity. The joint analysis of laboratory data and four years (2015-2018) of the meteorological variables outside the laboratory shows the correlation between the 222 Rn concentration and the outside temperature. The collected information stresses the relevance of designing good Rn-mitigation strategies in current and future experiments at LSC; in particular, we have checked for two years (2017-2018) the good performance of the mitigation procedure of the ANAIS-112 experiment. Finally, in another measurement (2019 for two years of live time, we report an upper limit to the residual 222 Rn content of the radon-free air provided by the radon abatement system installed in the laboratory.
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