The University of Surrey study finds that birdsong is associated with improved mood and lower anxiety, but those psychological benefits decline as soon as traffic noise is audible. More than 1,500 online respondents reported reduced restoration when traffic sounds were present, and 63 heart-rate–monitored participants showed physiological stress responses after traffic noise was added. Stress markers appeared even when noise stayed below the World Health Organization's daytime guideline, underscoring the need to protect natural soundscapes as part of public health and urban planning.
Birdsong Lowers Anxiety — Even Low Levels of Traffic Noise Can Cancel the Benefit
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Birdsong can do more than provide a pleasant backdrop for a walk: research links it to improved mood and reduced anxiety. A recent University of Surrey study, highlighted by Jalopnik and published via the British Ecological Society, shows those psychological benefits can disappear as soon as traffic noise becomes audible.
The researchers produced nine audio recordings combining varying levels of birdsong and traffic noise. In an online phase, more than 1,500 people rated how each soundscape made them feel. In a laboratory arm, 63 volunteers listened while wearing heart-rate monitors so scientists could track physiological stress responses alongside self-reports.
Across the soundscapes, participants consistently associated birdsong with positive psychological effects regardless of how loud or complex the natural sounds were. However, those perceived benefits dropped as soon as traffic noise was noticeable. The laboratory group also showed measurable stress responses (via heart-rate changes) after traffic sounds were introduced.
Notably, the physiological stress markers appeared even when traffic noise levels remained below the World Health Organization's daytime guideline — suggesting that people may experience stress from traffic sounds at levels they consider acceptably quiet.
Broader Context and Implications
Noise pollution has long been linked to hearing loss, anxiety, sleep disruption, and cognitive problems. By some estimates, noise in Europe reduces population health by roughly one million healthy life years per decade. This study adds to growing evidence that protecting access to nature must include preserving natural soundscapes — and the silences between sounds — not just green spaces.
What this means: Urban planners, park managers and public-health officials should consider soundscape quality when designing and protecting outdoor spaces. For individuals, seeking quieter routes or listening to birdsong recordings with minimal background traffic may be more restorative than expected.
Study details: Nine audio recordings combining different levels of birdsong and traffic; >1,500 online respondents; 63 participants with heart-rate monitoring; results published via the British Ecological Society and highlighted by Jalopnik.
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