More attenuation is not better
Specifying the highest-rated defender on the shelf feels cautious. It is not. Overprotection isolates workers from alarms, reversing vehicles and spoken warnings, and the usual response is to lift one cup — which drops effective protection close to zero.
Target the protected level
The goal is to bring exposure at the ear into a target band that is safely below the action level but still permits situational awareness. Aim for that band rather than for the largest number you can find.
A defender that gets lifted to hear a colleague delivers less real protection than a lower-rated one worn continuously.
Real-world attenuation is lower than the label
Laboratory ratings are obtained under ideal fit conditions. Field performance is consistently lower, particularly for roll-down foam plugs inserted without training. Derate accordingly, and train insertion technique rather than assuming it.
Choose the format for the task
- Earplugs — continuous exposure, hot environments, under helmets
- Earmuffs — intermittent exposure, easy to remove and refit, easy to supervise visually
- Level-dependent muffs — where speech and warning signals must remain audible
Audiometry closes the loop
Regular hearing tests are the only way to know whether your programme works. A shift in a worker's threshold is a control failure to investigate, not a statistic to file.
