**4. Methodology**

This study is based on postgraduate research by Cobo Dorado [1]. A large set of SPL measurements were performed, using a CESVA SC-30 Sound Level Meter with Octave Band Analyzer, Type 1 according to IEC 60651:01 and 60,804:00. Calibration was checked before and after each measurement with a portable calibrator CESVA CB006, Type 1. A windscreen was used in all cases. The instrument was placed on a tripod at a height of 1.50 m.

The meteorological variables were measured at each measurement point using a portable climatic station with a digital anemometer Speedtech WindMate 300. A fixed meteorological station located at the perimeter of the industrial plant was used as a local reference element. This station records every 10 minutes, date, time, wind speed (m/s), wind direction (degrees), temperature (°C), and relative humidity (%) and air quality parameters.

A Garmin GPS was used for georeferencing of each measurement point.

To carry out the assessment of the acoustic performance of the tree barrier under study, the following approach has been used:


All the data processing was performed using electronic spreadsheets.
