**7. Future Work**

The future lines of this work are to focus on the quantification of spectro-temporal variations, depending on the type of channel being used. Research into the best metrics will be pursued, in order to state whether the majority of the anomalous noise events, and even road traffic noise, is modified by the coherence bandwidth, which depends on the multi-path channel described. At the same time, the next natural step of this study will be an analysis focused on the generalisation of study of the channel performance to all available ANEs, where the impact on behavior will be determined as ANED accuracy for different types of channel. Finally, the degree of generalisation of the detection of acoustic events in time-varying propagation environments (with varying numbers and lengths of paths) will be studied, based on the sample of a narrow street with tall buildings or a wider street with more traffic noise.

**Author Contributions:** R.M.A.-P. has conceived the analysis and written a part of the paper. P.B. has coded the tests and written the rest of the paper.

**Funding:** There is no funding support.

**Acknowledgments:** The research presented in this work has been partially conducted with data obtained in the framework of the LIFE DYNAMAP project (LIFE13 ENV/IT/001254). The authors would like to thank Marc Arnela for his support. The authors would like to thank the 5th Electronic Conference on Sensors and Applications for the invitation to publish in Sensors regarding the Best Paper Award in the conference. Pictures of sensors hb137 and hb145 are courtesy of the colleagues of Universitá degli Studi di Milano Biccoca. The authors would like to thank 7:36 S-103 W6 14-C and 14-D for the hosting of most of this work.

**Conflicts of Interest:** The authors declare no conflict of interest.
