The Harmful Effects of Industrial Noise and How to Choose the Right Hearing Protective Equipment 
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Every day, millions of people work in constant noise conditions — in factories, construction sites, workshops, and studios. Many become so accustomed to it that they stop noticing the problem. Meanwhile, it builds. Let’s explore the dangers of industrial noise and how to choose protective equipment that really works.
Why is industrial noise dangerous?
Noise is more than just an irritant. When exposed regularly, it causes very specific, measurable harm to the body. And the worst part: the effects accumulate unnoticed, over years.
Hearing
The main target is the hair cells of the inner ear. They perceive sound waves and transmit signals to the brain. The problem is that these cells do not regenerate. Their death is irreversible.
According to SanPiN 1.2.3685-21, the permissible noise level in the workplace is 80 dB for an eight-hour workday. At 85 dB, the risk of hearing damage increases significantly, and at 100 dB and above, irreversible damage can occur after just a few years of unprotected work.
According to the World Health Organization, more than 16% of cases of hearing loss in adults are directly related to occupational noise exposure.
In addition to hearing loss, prolonged exposure to noise causes tinnitus — a constant ringing or buzzing in the ears. This is a chronic condition that is virtually impossible to completely cure.
The nervous system and blood pressure
The brain perceives noise as a threat. The body responds with stress: cortisol levels rise, the heart rate quickens, and blood pressure increases. With constant exposure, this leads to:
- chronic fatigue and irritability;
- sleep disorders;
- increased risk of hypertension and cardiovascular disease.
Noise kills not only hearing, it slowly wears out the entire body.
Types of hearing protection
Personal protective equipment (PPE) for hearing is divided into three main types. Each has its own area of application.
Earplugs (earplugs)
They fit into the ear canal and block noise by creating a tight seal. They come in disposable (polyurethane foam) and reusable (silicone or flanged).
Pros: compact, inexpensive, and don’t interfere with movement or tool use.
Cons: require proper installation — if used incorrectly, protection is significantly reduced. Many people find them uncomfortable to wear for long periods.
Anti-noise headphones
They seal the outer surface of the ear and absorb noise thanks to their multilayer construction. Earmuffs are particularly effective at high and mid frequencies — the frequencies typical of most industrial processes.
Pros: easy to put on and take off, highly visible (important for PPE monitoring), suitable for people with special ear structures.
Cons: bulky, can become hot when worn for long periods, requires compatibility with other protective equipment (helmet, goggles).
Helmets with integrated hearing protection
A safety helmet with built-in ear muffs on the arches. Convenient for situations where you need to don and doff the helmet frequently, such as when periodically entering a noisy area.
Pros: All-in-one, no need to carry a separate kit.
Cons: More expensive, antiphones not always replaceable separately.
How to choose PPE: a step-by-step guide
Step 1: Measure the noise level in your workplace
Without this, any choice is blind. Noise levels are measured with a sound level meter and recorded on special assessment of working conditions (SAWC) cards. If you have such a card, look it up. If not, ask your employer.
Step 2: Pay attention to the SNR indicator
SNR (Single Number Rating) is the average noise reduction rating in dB. The higher the SNR, the better the protection. The rule is simple: the noise level at the workplace minus the SNR of the hearing protection should result in a value no higher than 75–80 dB at the ear.
Example: the noise level in a workshop is 100 dB. Earplugs with an SNR of 25 dB will give a reading of ~75 dB at the ear. This is acceptable. Headphones with an SNR of 33 dB will give a reading of ~67 dB — even better.
Step 3: Consider the type of production
For constant high-frequency noise (saws, milling machines, compressors), earmuffs or a combination of earplugs and earplugs are preferable. For impulse noise (impacts, gunshots), high peak protection is essential.
Step 4: Check compatibility with other PPE
If you wear a helmet, safety glasses, or a face shield, make sure the earmuffs don’t interfere with their seal. A gap between the goggles’ temples and the ear cushions of the earmuffs reduces protection by 5 to 15 dB.
Step 5: Assess comfort for long-term wear
The best protective equipment is the one you actually wear. If earplugs feel unbearably tight after two hours, and headphones are too heavy, they’ll end up in your pocket. Be sure to let workers try several options.
Common mistakes when choosing
"Earplugs are for everyone." No. Everyone’s ear canal is different. Some people are physically unable to properly fit standard earplugs, and the protection provided is minimal. In such cases, headphones are more reliable.
"More expensive means better." Price doesn’t always correlate with protection level. Budget-friendly polyurethane foam earplugs with an SNR of 35 dB may provide better protection than expensive reusable earplugs with an SNR of 22 dB. Look at the specifications, not the price tag.
"One type of protection is sufficient for any noise level." For noise levels above 105 dB, it is recommended to combine earplugs and headphones. This isn’t paranoia — it’s a requirement of GOST 12.4.275-2014.
Conclusion
Industrial noise is a silent threat that doesn’t immediately cause pain but can wreak havoc on your health over the years. The good news: protecting yourself from it is easy and inexpensive. The key is to choose your PPE wisely and not delay it: know the noise level, look at the SNR, and consider your actual working conditions.
Take care of your hearing now - you won’t get it back later.