Danish study links road noise to Parkinson's risk
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A Danish study of 3 million people over 18 years found that long-term exposure to road traffic noise increases the risk of developing Parkinson's disease. Each 11.5-decibel increase in noise at the loudest side of a home was associated with a 3% higher risk. The findings were published in JAMA Neurology.
Study Methodology
Researchers from Denmark used a scientific model to calculate actual noise levels at each home since 1990, rather than relying on surveys. They measured noise on the loudest side (usually facing the street) and the quietest side (often facing a courtyard), then calculated a 10-year rolling average for each person, even if they moved. The team used the Danish National Patient Registry to identify all Parkinson's diagnoses over 18 years, adjusting for age, sex, income, and air pollution.
Key Findings
The study found a clear link between long-term traffic noise exposure and increased Parkinson's risk. For every 11.5-decibel increase in noise on the loudest side, risk rose by 3%. In the bedroom area, the association was stronger: each 8.9-decibel increase was linked to a 4% higher risk. Access to a quieter side of the home reduced risk: a difference of at least 10 decibels between the quietest and loudest sides was associated with lower risk for those exposed to noise above 50 decibels.
Implications for Urban Planning
The researchers stated that traffic noise in residential areas is not just a comfort issue but a previously overlooked risk factor for Parkinson's. They suggest that urban planners could design quieter neighborhoods by placing bedrooms and living rooms away from busy roads. Parkinson's disease currently affects over 8.5 million people worldwide and is the second most common brain disease.
What's Next
The findings may prompt further research into noise mitigation strategies for urban areas. It remains unclear whether specific noise reduction measures, such as soundproofing or traffic rerouting, can effectively lower Parkinson's incidence.
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Danish study links road noise to Parkinson's risk
