Industrial noise

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Industrial noise, or occupational noise, is often a term used in relation to environmental health and safety, rather than nuisance, as sustained exposure can cause permanent hearing damage. Industrial noise is a hazard traditionally linked to heavy industries such as ship-building and associated with noise-induced hearing loss (NIHL), a form of occupational hearing loss. Modern thinking in occupational safety and health further identifies noise as hazardous to worker safety and health in many places of employment and by a variety of means.

Noise can cause hearing impairment at long-term exposures of over 85 decibels (known as an exposure action value), and it also acts as a causal factor for stress and raises systolic blood pressure.

Noise can be a causal factor in work accidents, both by masking hazards and warning signals, and by impeding concentration. Noise acts synergistically with other hazards to increase the risk of harm to workers. In particular, noise and dangerous substances (e.g. some solvents) that have some tendencies towards ototoxicity may give rise to rapid ear damage.

A-weighted measurements are commonly used to determine noise levels that can cause harm to the human ear, and special exposure meters are available that integrate noise over a period of time to give an Leq value (equivalent sound pressure level), defined by standards.


Acoustic quieting is the process of making machinery quieter by damping vibrations to prevent them from reaching the observer.

When two identical industrial noise sources are side by side producing a recorded noise at 100 dB(A) the reduction in noise from shutting off one of the noise sources is about 3 dB resulting in 97 dB(A).

When one doubles the distance from a noise source the recorded noise level is reduced by 6 dB. This is also called the Rule of 6. This is based on the fact that the equation to calculate noise attenuation at a distance d_2, knowing the SPL at distance d_1 is given by 10log_{10}\left[\left(\frac{d_2}{d_1}\right)^2\right] = 20log_{10}\left[\frac{d_2}{d_1}\right], where d is the distance. If the distance is doubled, the equation simplifies to 20*log_{10}(2) which equals 6.02 (or approx. 6)

In recent years, Buy Quiet programs and initiatives have arisen in an effort to combat occupational noise exposures. These programs promote the purchase of quieter tools and equipment and encourage manufacturers to design quieter equipment.[1]


Industrial noise can also be combated with legislation. A 2012 Cochrane review found low-quality evidence that legislation reduced industrial noise both immediately and in the long-term.[2]

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  2. ^ Verbeek, Jos H.; Kateman, Erik; Morata, Thais C.; Dreschler, Wouter A.; Mischke, Christina (2012). "Interventions to prevent occupational noise-induced hearing loss". The Cochrane Database of Systematic Reviews 10: CD006396. doi:10.1002/14651858.CD006396.pub3. ISSN 1469-493X. PMID 23076923. 

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