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One More Reason to Hate Traffic: A Startling Link to Parkinson’s Disease
A sweeping study of 3.1 million adults in Denmark—the largest of its kind—found a striking association between chronic road noise near home and the progressive neurological disorder
Jul 26, 2026
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Apparently, traffic really can get on your nerves
An 18-year study of more than 3.1 million Danish residents aged 40 and older—the largest scientific project of its kind, researchers say—found that long-term exposure to the roar of road traffic could be linked to a higher risk of Parkinson’s disease, the debilitating disorder that damages brain cells and the nervous system
The study, conducted by a team from four universities and research institutes in Denmark and published in JAMA Neurology, showed a 3 percent rise in Parkinson’s risk for every 11.5-decibel jump in road-traffic noise outside the street-facing facade of participants’ homes. For context, traffic noise typically ranges from about 40 to 60 decibels on tranquil residential streets to 70 decibels or more along busy roads and highways
Noise levels were measured at the noisiest and quietest exterior sides of participants’ residences
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“Long-term exposure to road traffic noise was associated with higher PD risk,” the researchers wrote. “Having a quiet façade mitigated this association.”
The link between loud traffic and Parkinson’s remained consistent across all demographic and socioeconomic categories, including sex, income, education, relationship status, and population density
“These findings suggest noise as a novel risk factor for PD,” the study concluded, “and support mitigation strategies ensuring a quiet residential side.”
