Exposure to nighttime road traffic noise is linked to changes in the blood, leading to worsened cholesterol and cardiovascular risks, according to a European study. Researchers analyzed data from over 272,000 adults, estimating nighttime noise exposure at participants' homes. Blood samples revealed that louder nighttime noise, particularly above 55 decibels, was associated with increased concentrations of cholesterol-related biomarkers, including LDL "bad" cholesterol.
As noise levels increased from around 50 decibels, cholesterol markers rose steadily. The study authors concluded that this nighttime noise exposure is associated with alterations in blood cholesterol and lipid profiles. Researchers noted a clear exposure-response pattern, suggesting metabolic changes become more evident as noise levels rise.
Experts recommend measures such as improving sound insulation and placing bedrooms on quieter sides of the home to mitigate these risks. Protecting the nighttime sleep environment is considered especially important due to sleep's role in linking noise to health impacts. The potential public health impact is considered substantial as traffic noise affects a large population.