Living Near Dry Cleaners Associated with Higher Parkinson’s Risk

Scientists at the Barrow Neurological Institute analyzed Medicare records for nearly 19 million U.S. adults aged 67 or older. The analysis, published as an early manuscript in *npj Parkinson’s Disease*, found that people residing within about 500 feet (150 meters) of a dry-cleaning business had a 14 percent greater risk of developing Parkinson’s disease compared with those living several miles away. The risk declined as distance increased. A subset of cases involving gait and balance problems showed an up to 23 percent higher risk, and dementia-associated Parkinson’s showed a 25 percent increase in the same proximity range.

ScienceAlert

• Population: ~19 million Medicare beneficiaries (2016-2018).

Parkinson’s Risk Higher Near Dry Cleaners

• Cases: ~180,000 newly diagnosed Parkinson’s patients.

Newsweek

• Risk Gradient: 14 % higher overall risk within 500 feet; risk rose to 23 % for gait-related Parkinson’s and 25 % for dementia-linked forms.

ScienceAlert

• Regional Hotspots: Strongest associations observed in southeastern Illinois, the Tennessee-Kentucky border, and the Dallas-Fort Worth area; additional clusters identified in Michigan, Pennsylvania, Indiana, Southern California, and the New York City region.

Parkinson’s Risk Higher Near Dry Cleaners

Dry-cleaning operations have historically used chlorinated solvents—first trichloroethylene (TCE) and later perchloroethylene (PCE). Although TCE use has largely been phased out, many cleaners switched to PCE, which can degrade into TCE in soil and groundwater. Both chemicals persist for years, can migrate through groundwater, and may enter nearby buildings as vapor (“vapor intrusion”). Residents of densely populated neighborhoods where dry cleaners are located can therefore be exposed via inhalation or dermal contact, even without direct occupational contact.

New York Post

Dr. He emphasized that identifying such exposures is a step toward potential disease-burden reduction. Dr. Umer Akbar, director of the Movement Disorder Center at Hackensack Meridian Neuroscience Institute, cautioned that the findings demonstrate an association, not causation, because individual chemical levels were not measured. Both researchers suggested that limiting environmental exposure could eventually inform preventive strategies.

Newsweek

• Risk Magnitude: Newsweek and PublicHealthWatch report a 14 % increased risk, while ScienceAlert notes an up to 23 % increase for overall Parkinson’s risk and higher percentages for specific subtypes.

ScienceAlert

• Odds vs. Risk: The New York Post describes a 13 % higher odds overall and reports that in southern Illinois the odds were more than double, a figure not quantified in the peer-reviewed manuscript.

Parkinson’s Risk Higher Near Dry Cleaners

• Exposure Measurement: The study relied on 2013 dry-cleaner location data and did not assess actual chemical concentrations, building characteristics, or business activity, limiting causal inference.

ScienceAlert

• Regional Mechanisms: Researchers hypothesize that local geology, aging infrastructure, and population density may modulate vapor intrusion risk, but precise pathways remain unverified.

Newsweek

If residential proximity to dry cleaners contributes to Parkinson’s disease incidence, targeted disease surveillance in identified hotspots could guide environmental investigations and remediation efforts. The findings also reinforce broader concerns about chronic exposure to chlorinated solvents, supporting policies that encourage phase-out of PCE and adoption of greener cleaning technologies. Public-health agencies may consider integrating proximity metrics into risk-assessment models for neurodegenerative diseases, although further studies measuring actual indoor air and groundwater contaminant levels are needed to move from association to actionable guidance.

ScienceAlert