Control the sound before it reaches you
The strongest protection is a quieter source: turn equipment down, choose a quieter tool, close an acoustic barrier, or leave the noisy area. The NIOSH prevention guidance places noise control ahead of relying only on earplugs or earmuffs.
Distance matters. Moving away from a speaker, machine or tool can reduce exposure. Time matters too: shorten the noisy task and take recovery breaks in a genuinely quieter place.
Use the 85 dBA figure correctly
NIOSH’s recommended occupational exposure limit is 85 A-weighted decibels over an eight-hour shift. It is not a promise that every sound below 85 dBA is harmless or that 85 dBA is safe indefinitely. Higher sound levels allow less exposure time, and impulsive sounds such as gunfire need specialised controls.
Phone sound meters and watch alerts can raise awareness, but consumer devices may not be calibrated for compliance decisions. Workplace measurements should come from an appropriate hearing-conservation or safety programme.
Fit protection for the activity
The NIDCD noise-induced hearing-loss guide recommends hearing protectors when sound cannot be reduced or avoided. A protector only works as intended when it fits and remains in place.
Roll-down foam plugs need correct insertion; reusable plugs need the right size and clean seals; earmuffs need an unbroken cushion seal. Glasses, hair and headwear can affect earmuff fit. Musicians, shooters, motorcyclists and industrial workers have different communication and impulse-noise needs, so use activity-specific advice.
Listen to the warning signs
Temporary muffling or ringing after noise means the exposure was significant. The NIDCD notes that apparent recovery after a temporary change does not prove there was no residual harm. Reduce the next exposure and arrange a hearing test if ringing, muffling or speech difficulty persists or recurs.
Sudden major hearing loss after a blast, especially with pain, drainage or dizziness, needs urgent medical care.