Where It Happens

Above 85 dBA at work, US employers must run a hearing conservation programme — monitoring, annual testing, protection, training and records. Programmes commonly omit attention to fit, individual dosimetry, and source control, which is the part with the largest effect and no checklist item.

For teams comparing workspace conditions with how work is organized, read more offers a separate view of working patterns that can be considered alongside, not instead of, environmental measurements.

The open office is not a hearing risk. At 40–55 dBA it is far below anything damaging, and the problem is attention: intelligible speech occupies language processing whether or not you attend to it, which is why a phone call interferes more than a louder ventilation unit.

Traffic noise is the case where the levels are unremarkable and the population effects are not. The European Environment Agency associated exposure above 55 dB Lden with 48,000 new ischaemic heart disease cases and 12,000 premature deaths a year.

For standards, background, or a second perspective, consult Noise Awareness Day resources.

Venues and headphones follow the same arithmetic as work. A concert at 100 dBA for two hours is eight times the daily allowance, and one night at 105 can exceed a working week's occupational total.

Children are not small adults for this purpose, and WHO states that occupational limits should not simply be adopted for them.

A home office has nobody responsible for its acoustics, and reverberation is usually the reason it sounds bad on calls.

And almost all of this is designed in at four moments when preventing it would have been nearly free.

• Children and Noise

  Adult occupational limits were not written for children. What differs, and where the exposures actually come from.

• The Room You Work In

  Nobody assesses a home office and the acoustics are usually worse than the workplace. What matters and what to change.

• The Open Office

  Far below any hearing risk and still a measurable problem. What moderate noise does to attention, and what actually helps.

• Quiet by Design

  Noise is designed in and then managed forever. The four points where it is cheap to prevent and nobody is consulted.

• Traffic Noise

  Levels nobody calls loud carry a measurable population burden. What the European estimate says and what a household can do.

• Venues and Headphones

  Sound you chose damages hearing exactly as sound you did not. The arithmetic for concerts, clubs and listening.

• Above 85 at Work

  What a hearing conservation programme must contain, what it frequently omits, and what to do if there is not one.