How dangerous is 105 dB really?

The noise level of 105 dB (A) corresponds to:

• A full-power circular saw
• A starting jet engine 100 metres away
• A concert up close

According to the Working Conditions Act 85 dB (A) is already the limit where hearing protection must be worn. 105 dB (A) is therefore far above that. In Belgium A similar limit value applies: from 85 dB (A), wearing hearing protection is mandatory and the employer must take additional measures, such as noise measurements, information and medical follow-up.

Those who work in these noise conditions need structural protection. Not only to comply with the law, but also to keep hearing healthy in the long term.

Which hearing protection is suitable at 105 dB?

Not every hearing protector is suitable for such high levels of noise. The attenuation must be sufficient and fit the ears properly. The fit is especially important, because with a poor-fitting protector, sound still comes in.

Suitable options at 105 dB are:

• Earmuffs with a high attenuation value (up to approximately 30 dB (A))
• Earplugs that are placed well and deep in the ear canal
• Customized hearing protection, such as otoplastics, with a filter tailored to the situation

For these types of noise levels, a combination of hearing protectors is often chosen. Think of plugs and covers at the same time. The maximum attenuation is then approximately 35 dB (A). Please note that sound vibrations can also be transmitted via the bone, so complete noise isolation is never achievable.

Is hearing protection mandatory at work at 105 dB?

Yes, absolutely. At 105 dB (A), wearing hearing protection is required by law. In addition, employers must take additional measures to limit exposure as much as possible.

Examples include sound-insulating enclosures around noise sources, or adapting working methods, such as using quieter machines or other working methods. Alternating between tasks also helps, so that employees are exposed to noise for less time in a row.

The limit value of 87 dB (A), which includes the effect of hearing protection, must not be exceeded. In an environment with 105 dB (A), the hearing protector must therefore attenuate at least 18 dB to meet that standard.

Why is customization often the safest choice?

Standard hearing protectors can work well, but are dependent on correct placement. In case of long-term use or situations where communication is important, customized hearing protection offers more security.

These custom-made earplugs fit the ear canal perfectly. They stay in place better, offer stable damping and are often more comfortable to use. In addition, it is possible to choose filters that do let voice and signals through.

For those working in an environment with 105 dB (A), this is often the most secure and workable solution.