Over-protection - what are the issues?
Over-protection means hearing protection is too strong for the noise risk, and yes, that is an actual thing…
Can never have too much protection?
Over-protection often comes from well-meaning employers buying the strongest hearing protection they can find - hearing protection with the highest SNR.
They mean well but it often actually increases risk and for the employer, means more of the money they spend on hearing protection is wasted.
Hearing protection which is too weak causes an increase in risk.
Hearing protection which is spot-on is peak protection.
Hearing protection which is too strong starts to cause an increase in risk again.
When hearing protection is too strong people often feel isolated and too cut-off from their surroundings at work. They can’t hear vehicles around them which introduces other risks, and they can struggle to ear other people speaking.
Another impact is that importantly for employers, experienced staff will use how machines sound as they operate as a sign that all is as it should be. If they are too isolated they can miss those audio cues of something not working quite as it should, or again they remove the protection so they can hear more clearly.
Almost inevitably, hearing protection which is too strong means people often simply don’t wear it, or if they do they only put it in loosely - ear plugs are sticking out of their ears or ear muffs are slightly off-set and not quite fully on the ears. You see ear plugs held in place by the hairnet in food factories rather than inserted, or ear muffs placed loosely over hoods and hats.
The people themselves are then at risk of noise damage whereas with less powerful protection it can be worn properly and the risk controlled and often they get better protection.
Less powerful hearing protection can actually mean more protection as it is more likely to be worn properly, and other risks such as moving vehicles are minimised.
Giving people ear plugs and telling them to wear them is not enough for the employer to have met all their responsibilities so if the hearing protection is too strong and people then don’t wear it properly the employer can still be liable for any resulting hearing damage.
A real-world example of over protection issues
I did a noise assessment for a large food factory where with the best of intentions they had chosen ear plugs with an SNR of 34 dB, a very high level. (The scale goes from 15 dB at the least-attenuating to 39 dB right at the top end.) They had a few hundred people working on the site and were spending about £20,000 a year on hearing protection.
However, on the noise assessment almost every person had the ear plugs held against their ears by the food-safe hairnet and pretty much nobody had them inserted into the ears. The plugs were doing nothing other than there for show. When I asked people about it the answer was always the same - ‘I can’t hear anybody speaking with them in’.
The employer was spending £20k a year for pretty much no protection and no benefit to either them or the individuals, while still retaining liability for any hearing problems.
The noise assessment showed they actually needed hearing protection with an SNR more around 20 dB. At this level it would take enough off the noise to make it safe but be far less isolating for staff and remove one of the key reasons for non-compliance.
Manufacturers selling based on strongest is best
A lot of online sellers of hearing protection and some of the less well-established manufacturers market their hearing protection as being strong, or even ‘the strongest on the market’. That ‘strongest is best’ narrative is common to see online.
To non-noise people this seems perfectly reasonable - surely more protection is better than less protection so stronger hearing protection must be the way to go and it is entirely understandable that a lot of employers do head down that path.
In a noise assessment though I measure how loud the noise is and then calculate how effective the hearing protection is for that specific risk, so the employer can be sure the hearing protection is in the Goldilocks zone - not too strong, not too weak, but just right.
Links for more information
Link: Choosing the right hearing protection - calculating how strong is needed
Link: Free hearing protection assessment tool
Stronger hearing protection is not better. Indeed stronger is often worse, causes increased noise exposures and leaves employers paying for hearing protection which is not actually doing much.
Last updated: February 2026
