## 1 Introduction
According to our documentation research, until present, impact noises, as part of global noise near a residential zone, were not treated in a comparative manner with 2D/3D simulations and a measurement method. A shopping centre area was chosen for the reason that there are both existing tonal broadband HVAC noise and impact noise, as important sources of creating annoying effects and a health threat on people located in the adjoining residential area. If traffic noise is considered as an important disturbance mainly as a level, tonal and impact noises are viewed as direct health threats with various psychosomatic annoying noise-related responses. We have assumed that the location of a noise source at a higher level, as is the case of air conditioning units placed on a building, could have a different influence on the receiving points at the facade of the adjoining buildings, compared with the noise produced by traffic. Thereby, the influence of the ground and vegetation could have a reduced influence on sound attenuation measured at the level of adjacent building facades. In this paper, the noise produced by the activity of a commercial centre situated at a small distance from residential buildings is analysed. The main noise sources in this study are represented by the air conditioning units that are positioned on the roof of the commercial building and the noise generated by the activities of loading and unloading performed on the supply ramp. Having a small distance between the commercial centre and the residential buildings and considering the continuous functioning of the AC&HP units, a special attention must be paid to these types of noise sources due to their continuous functioning regime and especially by their tonal character for which some added correction must be applied, thus the noise is felt as louder. The close proximity of the commercial centre near the residential buildings has led to the necessity of performing a noise impact study before starting its construction. The noise exposure of surrounding inhabitants is analysed using a VBEB (Vorlaufige Berechnungsmethode zur Ermittlung der Belastetenzahlen durch Umgebunglsarm) method, which estimates the number of exposed inhabitants, this analysis being presented in the next chapter. The first phase of the study consists of measuring the noise levels at the facade of the analysed buildings in order to assess the background noise level of the analysed area. The second step consists of modelling the residential buildings, the commercial building and noise sources by using IMMI software (noise mapping and prediction software), 2012 version. The noise prediction shows that the legal noise limits are exceeded, leading to the necessity of studding different noise reduction solutions. Five scenarios are considered: the first scenario consists of a noise prediction of all the noise sources in the surrounding area; in the second scenario, a parallel noise barrier with the supply ramp is modelled; in the third scenario, a higher barrier is studied; in the fourth scenario, a construction in which the supply van enters is modelled; and the last scenario is where the noise barriers are mounted on the roof near the noise sources. The last chapter presents the situation after the construction of the shopping centre, in which a noise measurement campaign is performed in order to validate the prediction results.