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Studies concerning 222Rn emission from soils are growing interest in the Earth Sciences, due to the gas potential as a tracer of natural phenomena. This paper presents a study of radon monitoring in two sites of Campi Flegrei caldera (Neaples, Italy) during the period July 1, 2011–December 31, 2017. This area was characterized by several phases of volcanic unrest. A hybrid method based on Multiple Linear Regression + Remote Radon Estimation method + Singular Spectrum Analysis (MLR + RRE + SSA) is developed for the trend extraction and the identification of anomalies in the time series of 222Rn. The results are compared with several routinely used geo-indicators of the caldera unrest. The comparisons show strong correlation among the signals. The present study proves the 222Rn is a potential indicator of the evolution of a volcanic crisis. • Radon time series at 2 sites of Campi Flegrei caldera (Naples, Italy) are studied. • The time series analysis is performed for the trend and anomalies extraction. • The results are compared with geo-indicators of caldera unrest. • Radon trends follow the dynamic changes in gas flow regime within caldera. • Radon anomalies mimic the evolution of Campi Flegrei volcanic unrest. [ABSTRACT FROM AUTHOR]