As acousticians, we frequently observe that noise in the workplace is downplayed until employees begin complaining of tinnitus or chronic fatigue. Below, you will find hard data based on European directives and Polish law, presented without any unnecessary fluff.

Workplace noise standards - the hard figures (OEL)

In the context of health and safety regulations and acoustics, the key concept is the Occupational Exposure Limit (OEL). Based on Directive 2003/10/EC of the European Parliament, which harmonises regulations across all member states, workplace noise standards are strictly defined for three parameters:

1. Noise determined at the daily exposure level (8h): The limit is 85 dB, where the key metric for occupational exposure assessment is the equivalent continuous sound level (A).

2. Maximum A-weighted sound level (LAmax): Must not exceed 115 dB.

3. Peak C-weighted sound pressure level (LCpeak): Must not exceed 135 dB.

It is worth noting that the permissible noise standards in the workplace also include so-called "action values". Already at 80 dB, the employer must provide access to hearing protection, and at 85 dB, wearing them becomes mandatory, and the workstation must be appropriately marked.

Workplace noise levels and your health

Why does the European Union take such a strict approach to these values? Research by the European Agency for Safety and Health at Work (EU-OSHA) indicates that a noise level in the workplace exceeding 80 dB poses more than just a risk of permanent hearing damage.

It also acts as a powerful systemic stressor. Even if the noise at the workstation is not "painful", long-term exposure increases cortisol levels, raises the risk of cardiovascular diseases, and drastically reduces concentration. In open-plan offices, where informational noise (conversations) dominates, the issue is not the decibel level, but speech intelligibility, which distracts our attention.

Measuring workplace noise – how do we do it?

To determine whether standards are exceeded, a professional workplace noise assessment is essential. As acousticians, we do not use phone applications for this (which often have an error margin of +/- 10 dB), but rather calibrated integrating sound level meters of Class 1 or 2.

The procedure is as follows:

• We measure noise directly at the employee's ear (using noise dosimeters) or within the work area.

• We analyze noise in the work environment, taking into account the duration of specific activities.

• We calculate LEX,8h - the average noise dose that an employee "receives" over an entire shift.

What is noise? (A brief theory to conclude)

Now that you are familiar with the limits and hazards, it is worth clarifying the fundamentals. The physical definition of noise is any sound of any acoustic character that, under given conditions, is unwanted, harmful, or disruptive to health.

Interestingly, from a psychoacoustics perspective, even a quiet sound (such as a dripping tap or a whining coil in a monitor) can be classified as noise if it prevents concentration, even if health and safety standards are not exceeded.

Remember: Hearing is a sense that has no "eyelid" - we cannot close it. Therefore, managing acoustics in the workplace is not only a legal obligation but an investment in team productivity.