**7. Final remarks**

A case study about the acoustic performance of a tree barrier of *Eucaliptus dunii* has been presented. Some different approaches were used in order to calculate its insertion loss *IL*.

The noise source shows a linear SPL depletion law.

Also, the green barrier is performing as an acoustic one.

When comparing the data measured in P1 and the values calculated with direct propagation but without considering the presence of trees, an extra attenuation of approximately 12 dB with A-weighting appeared. The differences in frequencies of 1000 Hz and 2000 Hz wer even greater: 15 dB and 13 dB, respectively. For frequencies of 500 Hz and lower, there are also differences but not as huge as the abovementioned
