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The first low-background run of NEXT-100 at 3.95 bar has been devoted to the measurement of the radon-induced backgrounds impacting this search. The contributions from both the internal and external airborne radon have been evaluated. The internal \\Rn{222} activity is found to be (0.95$\\pm$0.04(stat)$\\pm$0.09(sys)) Bq/m$^3$, while no traces of \\Rn{220} have been observed. Most of the \\Rn{222} progeny plate-out on the surface of t","authors_text":"A. Brodoline, A. Castillo, A.F.B. Isabel, A. Larumbe, A.L.M. Silva, A. Marauri, A. Mart\\'inez, A. Para, A. Pazos, A.P. Marques, A. Sim\\'on, A. Trettin, A. Yubero-Navarro, B.J.P. Jones, B. Palmeiro, B. Romeo, C.A.N. Conde, C.A.O. Henriques, C.D.R. Azevedo, C. Echeverria, C. Herv\\'es Carrete, C.M.B. Monteiro, C. Rogero, C. Romo-Luque, C. Tonnel\\'e, D.R. Nygren, E. Church, E. Dey, E. Oblak, E. Ruiz-Ch\\'oliz, F. Auria-Luna, F. Ballester, F.I.G.M. Borges, F.J. Mora, F. Kellerer, F. Lopez, F. Monrabal, F.P. Coss\\'io, F.P. Santos, F.W. Foss, G. Mart\\'inez-Lema, H. Almaz\\'an, I.J. Arnquist, I. Osborne, I. Parmaksiz, I. Rivilla, I. Shomroni, J.A. Hernando Morata, J.D. Villamil, J.E. Barcelon, J.F.C.A. Veloso, J.F. Toledo, J. Garc\\'ia-Barrena, J. Hauptman, J.J. G\\'omez-Cadenas, J. Mart\\'in-Albo, J.M. Benlloch-Rodr\\'iguez, J.M.F. dos Santos, J. Molina-Canteras, J.M.R. Teixeira, J. Palacio, J. Pelegrin, J. Renner, J. Soto-Oton, J. Torrent, J. Waiton, J.W.R. Grocott, K.E. Navarro, K. Mistry, L. Arazi, L. Larizgoitia, L.M.P. Fernandes, L.M. Villar Padruno, L. Rogers, M. Cid, M. del Barrio-Torregrosa, M. Elorza, M. Mart\\'inez-Vara, M. P\\'erez Maneiro, M. Querol, M. Seemann, M. Sorel, M. Vanga, N. Byrnes, NEXT Collaboration: C. Cortes-Parra, N. L\\'opez-March, P.A.O.C. Silva, P. Dietz, P. Ferrario, P. Ferrero Manche\\~no, P. Herrero-G\\'omez, P. Lebrun, P. Novella, P.R.G. Valle, P. Saharia, P. V\\'azquez Cabaleiro, R. Coupe, R.D.P. Mano, R. Esteve, R. Felkai, R. Guenette, R.L. Miller, R. Madigan, S. Ayet, S.R. Soleti, S. Teruel-Pardo, S. Torelli, V. \\'Alvarez, V. Herrero, X. Cid, Y. Ayyad, Y. Ifergan, Z. 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