Bringing in an acoustical research firm from the beginning of a project allows full control of the acoustic solutions implemented and optimisation of the costs relating to the site's acoustic constraints.


All noisy machinery that is not specifically mentioned under the heading of classified facilities is subject to neighbourhood noise regulations. These regulations limit the emergence caused by the noise annoyance over the residual noise depending on whether it is produced during the daytime or night-time period.

Our studies regarding this consist in the first instance of carrying out measurements with and without the machinery running. Then, from the results and site constraints, we propose our recommendations for acoustic treatments so as to comply with current regulations.


First of all, EPCI's are subject either to declaration or to authorisation. The applicable regulations are therefore numerous, depending on the headings concerned.

On inception or extension of a site, current regulations demand the creation of a report on the project's overall impact on its environment. Noise pollution from the project is one of a large number of topics covered. This type of impact study includes in particular an analysis of the initial state, a study of the impact of the project on its environment and finally, the recommendation of acoustic treatments which will allow the criteria to be met.

Furthermore, for those EPCI's subject to authorisation, periodic checks every two or three years after authorisation are mandatory, sometimes even annually, depending on prefectoral decrees or for companies complying with ISO 14 001.

Alhyange accompanies either the companies or the project managers to ensure this approach is respected and that current acoustic criteria are met.


The impact study for a planned transportation infrastructure or a new installation begins by the broad description of the existing state.

The sound impact study for the new route on the environment and especially with respect to housing is then carried out with one simulation as at the opening date and another at +20 years.

The zones most affected by sound levels are then targeted so as to point recommendations and suggestions for structures that will limit noise pollution and to remain with current regulations.


Those EPCI's subjected to authorisation are controlled by prefectoral decrees specifying the interval between on-the-ground inspections.

Alhyange carries out these periodic inspection assignments by checking that the sound levels at the property boundary are within the criteria as well as in the regulated emergence zones (housing, offices …).

Our research department thus carries out regular sound diagnostics on quarry sites and waste treatment centres...