doi:10.1140/epjc/s10052-022-10859-zengAmaré, J.Bandac, I.Blancas, A.Borjabad, S.Buisán, S.Cebrián, S.Cintas, D.Coarasa, I.García, E.Martínez, M.Núñez-Lagos, R.Oliván, M. A.Ortigoza, Y.Ortiz de Solórzano, A.Pérez, C.Puimedón, J.Rodríguez, S.Salinas, A.Sarsa, M. L.Villar, P.Long term measurement of the 222Rn concentration in the Canfranc Underground LaboratoryART-2022-130648We report the results of 6 years (2013–2018) of measurements of 222Rn 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 222Rn concentration and the relative humidity. Both correlated variables show a seasonal periodicity. The joint analysis of laboratory data and 4 years (2015–2018) of the meteorological variables outside the laboratory shows the correlation between the 222Rn 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, we have monitored (2019–2021) for 2 years of live time, the radon-free air provided by the radon abatement system installed in the laboratory.2022http://zaguan.unizar.es/record/11984510.1140/epjc/s10052-022-10859-zhttp://zaguan.unizar.es/record/119845oai:zaguan.unizar.es:119845info:eu-repo/grantAgreement/ES/MICINN/PID2019-104374GB-I00info:eu-repo/grantAgreement/ES/MINECO/Consolider-Ingenio/CSD2007-00042info:eu-repo/grantAgreement/ES/MINECO/Consolider-Ingenio2010-CSD2009-00064info:eu-repo/grantAgreement/ES/MINECO-FEDER/FPA2011-23749info:eu-repo/grantAgreement/ES/MINECO-FEDER/FPA2014-55986-Pinfo:eu-repo/grantAgreement/ES/MINECO-FEDER/FPA2017-83133-PThe European Physical Journal C 82, 891 (2022), 10byhttp://creativecommons.org/licenses/by/3.0/es/info:eu-repo/semantics/openAccess