Noise reduction in the industry with noise maps – Part 1


Nowadays society is strongly sensitive to environmental issues and sustainability. DECO estimates that in Portugal there are about of 800.000 people exposed to excessive noise and complaints concerning this, are the most common complaint with respect to the environment. The noise emission and the right not to occur to disturb are regulated and people are informed of their rights. So the need to reduce the noise to acceptable values is an important priority for many companies. These noise reduction actions are often concerned significant investments, and we must ensure the success of the project and minimizing their costs, and this is a major concern of those responsible for the environment. Give the importance of objective approach exists as regards the assessment of the impacts of investments to make.

Limitations of sound impact assessments "traditional"

Sound impact assessments “traditional” use the short-term noise sampling, a limited number of points, of a given area. However, experience has shown that, often, and especially in the case of installations of large size and/or complexity, This approach allows to obtain reliable results or a clear view of the real impact of the different sound sources. Besides that, does not provide usually enough information to decision-making regarding the measures to implement, is it allows you to identify and classify sources of noise, neither provides a forecast of the results expected of a particular corrective intervention. Another aspect to take into account, is the difficulty that evaluations “traditional” have to introduce easy-to-read results for non-specialists. This hinders the effective communication of the results of noise "HCI" measures to potential interested, How are the surrounding community, State bodies, local authorities, environmental organizations, etc., not boosting properly the effects of those measures on the image of the Organization.

Still it is common to occur, under pressure of circumstances, and with some ignorance of current capabilities of the acoustical engineering, the implementation of massive investments, made more or less loose, noise reduction measures. For more at least loose we refer to investments based on "ouvidómetro", almost to divination, and without a strong technical justification. Some times, almost by luck the results of these investments is good, but sometimes it isn't..

This approach is not compatible with the requirements of management today, where is norma a detailed justification for each euro invested.

What if you want to

In this context, to make an investment in noise reduction in an existing installation, You must ensure that:
• At the end of the implementation of noise reduction measures, one or more receivers be exposed to noise levels pre-defined, inferior to existing.
• This is achieved through the implementation of one or more measures;
• These measures comply with, diverse order constraints, the noise-emitting facilities,
• To meet the various alternatives of existing measures;
• If you know the cost of each alternative,
• Know the estimated impact of each alternative, in terms of noise at(s) recetor (ES);
• The company be in possession of a powerful tool for dialogue with the plaintiffs and with the various State entities and other relevant entities,
• There is guarantee of results;
• That the cost/benefit is the best;

For these goals to be achieved there must be, a plan of action, as shown below:

Phase Description Euros
1 Solutions for achieving the objective of 52 dB(A) in the northern part of the village, QTA. the Marquesa, Neighborhood 1, village 2 and to the factory xxx
2 Solutions to extend the goal of 52 dB(A) to the nearest village from the factory YYY
3 Solutions to extend the goal of 52 dB(A) District area 2 and Belvedere zone, and the overall level of 45 dB(A). zzz
Total www

Ação2 plan

An investment in new facilities concerns are:
• Know that noise limits specified for new equipment,
• That these limits are not specified sub-coming new plants to generate excessive noise complaints;
• That the limits are not over-specified, generating avoidable costs.


Here you can view a presentation on this topic.


0 replies

Leave a Reply

Want to join the discussion?
Feel free to contribute!

Leave a Reply

Your email address will not be published. Required fields are marked *

This site uses Akismet to reduce spam. Learn how your comment data is processed.