Nighttime Road Noise Linked to Changes in Cholesterol Markers

A recently published European study examined the relationship between nighttime road traffic noise and metabolic health by analyzing health data from large population cohorts. The findings provide new evidence on how environmental noise may be linked to changes in blood lipid profiles.

The research, published in Environmental Research, included data from more than 272,000 adults who participated in the UK Biobank, the Rotterdam Study, and the Northern Finland Birth Cohort 1966. Researchers estimated the level of nighttime road traffic noise at participants’ home addresses using national noise mapping tools.

Participants were divided into groups based on their estimated nighttime noise exposure: below 45 decibels, around 50 decibels, and 55 decibels or higher. The group exposed to the highest noise levels showed increased concentrations of certain blood lipid biomarkers, including LDL and IDL lipoproteins and unsaturated fatty acids.

To assess the impact of noise independently, the study accounted for air pollution and other potential confounding factors. The analysis used nuclear magnetic resonance metabolomics to measure 155 different blood metabolites, focusing on cholesterol and related markers.

What the numbers show

• Over 272,000 adults from three European cohorts were included
• Exposure to 55 dB or more was linked to an average 0.41 mg/dL higher cholesterol
• Nighttime noise effects were observed starting at about 50 decibels

The results indicated that the association between nighttime noise and cholesterol-related biomarkers remained consistent across all study groups. Researchers observed a clear exposure-response pattern, with higher noise levels corresponding to greater changes in lipid profiles.

Study co-author Yiyan He, a doctoral researcher at the University of Oulu in Finland, stated that although the effect sizes were modest, the associations across multiple biomarkers were statistically robust and consistent. The study’s design allowed for evaluation of a wide range of metabolic indicators in relation to environmental noise exposure.

The World Health Organization has set recommended nighttime noise limits at around 40 to 45 decibels. The study found that changes in blood lipid markers were already apparent at noise exposures above 50 decibels, which exceeds these guidelines.

According to a German-language report, participants exposed to road noise at or above 55 decibels had on average 0.41 mg/dL higher total cholesterol compared to those exposed to less than 45 decibels. This finding further supports the observed association between environmental noise and metabolic health markers.

* This article is based on publicly available information at the time of writing.