The effects of noise on health: what science says
Noise is not just annoying. It is a documented health risk factor recognised by the World Health Organization, with effects that go well beyond hearing: heart, brain, sleep, mood. Understanding why is the first step towards change.
What the WHO says about noise in public spaces
The Environmental Noise Guidelines for the European Region published by the WHO in 2018 classify noise pollution as the second leading environmental health risk in Europe, after air quality. This assessment is based on eight systematic reviews of international scientific literature.
The documented effects of prolonged exposure to high sound levels:
- Cardiovascular effects — hypertension, increased risk of heart attack and ischaemic disease. A review published in the European Heart Journal (Münzel et al.) documents the association between environmental noise and cardiac pathologies even in the absence of hearing damage
- Sleep disturbances — levels as low as 40 dB are sufficient to produce measurable adverse effects. Above 55 dB public health risks increase significantly
- Cognitive impairment — reduced concentration, impaired working memory, accelerated mental fatigue. The brain uses cognitive resources to filter background noise, diverting them from primary tasks
- Chronic stress — noise activates the sympathetic nervous system even without awareness, triggering cortisol and adrenaline release. In professional settings it reduces productivity and increases errors
- Annoyance and quality of life — acoustic annoyance is an independent quality-of-life indicator recognised by the WHO, independent of physical health effects
Scientific references
- 📄 WHO Environmental Noise Guidelines for the European Region, 2018
- 📄 Münzel et al., European Heart Journal — cardiovascular effects of noise
- 📄 Spence C., Flavour Journal, 2014 — noise and taste perception
- 📄 Doxa / Groupon research — acoustic comfort in Italian venues
The specific case of bars and restaurants
Recreational environments have long been overlooked in noise pollution research, which has concentrated on traffic noise. The data, however, paint a concerning picture.
🍽️ Taste changes with noise
Psychologist Charles Spence of the University of Oxford demonstrated that high sound levels alter taste perception: they reduce the sensation of sweet and bitter, and increase that of salty. Eating in a noisy environment is not just uncomfortable — it literally changes the experience.
💬 Conversation breaks down
At levels of 80–85 dB, normal conversation becomes impossible without raising your voice. Each person raises their volume, increasing the overall level and forcing others to do the same. The final level can exceed 95–100 dB even without music.
🧠 Acoustic stress is invisible
The brain actively filters background noise even when we are unaware of it, consuming cognitive resources and producing cortisol. After a lunch break in a noisy venue, many people report fatigue and difficulty concentrating — a real effect, not a psychological one.