The paper presents a study on a novel CH4 low-cost metal oxide semiconductor sensor (MOS), calibrated and tested both in laboratory and field conditions. The scientific methodology used is sound, the writing is clear and exhaustive and the graphics are clear and all good standard. The results presented are of great importance to the scientific community, for the technical instrumental advancements, but also considering the potential future applications of such technology for the monitoring of long term series of data in remote and hostile conditions such as the Arctic ones. I’d like to thank all referees for their precious inputs: the authors have carefully included all comments, and satisfactorily replied to all questions brought up by the reviewers. Therefore I recommend this paper to be published in its revised form on AMT.