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A study of UK Biobank participants found that living closer to industrial facilities reporting water pollutants was associated with higher odds of developing progressive supranuclear palsy (PSP). The observational results do not establish that pollution caused the disease, and researchers cite possible misdiagnosis, confounding and overlapping emissions as limitations.
A study of UK Biobank participants found that people living nearer industrial facilities reporting water pollution had higher odds of developing progressive supranuclear palsy (PSP), a rare neurodegenerative disorder. The findings, published in Neurology and reported by MedPage Today on October 28, show associations rather than proof that pollution caused the disease.
Researchers compared 221 people diagnosed with PSP between 2007 and 2025 with 2,249 matched controls who had no recorded diagnosis of parkinsonism or dementia. They assessed participants’ baseline residential proximity to facilities listed in the European Pollutant Release and Transfer Register. The facilities included wastewater treatment plants, intensive aquaculture operations, chemical plants and thermal power stations.
Proximity to facilities reporting emissions of heavy metals was associated with higher odds of PSP (odds ratio 1.38; 95% confidence interval 1.03–1.85). Associations were also reported for pesticides (1.66; 1.12–2.46), other organic pollutants (1.52; 1.13–2.04) and other inorganic pollutants (1.60; 1.19–2.15). These odds ratios describe statistical associations in the study; they do not show an individual’s absolute chance of developing PSP.
The researchers reported that risk associations generally weakened as distance from facilities increased. They also said the length of time people lived near polluting facilities appeared relevant. The analysis used 2007, the earliest year of full UK Biobank recruitment, as its index reporting year. Facilities often released several pollutant types, making it difficult to isolate the effect of any one substance.
Pollution Exposure and PSP Risk
PSP is a progressive movement disorder that can involve parkinsonism, problems with eye movements and impaired balance. There is no treatment that effectively stops or slows its progression, according to the source report. Identifying possible environmental contributors could help guide research into prevention and disease mechanisms, but this study does not establish that reducing exposure would prevent PSP.
The findings also add to questions about whether environmental exposures may contribute to some neurodegenerative diseases. The reported associations involve proximity to facilities with pollution records, not direct measurements of what each participant drank, inhaled or otherwise encountered. The results should be treated as a reason for further investigation, not as evidence that people living near a listed site will develop the disorder.
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How Researchers Tracked Exposure
The study was conducted within the prospective UK Biobank cohort, using recorded diagnoses and residential locations to compare PSP cases with matched controls. Researchers linked addresses to nearby facilities in the European pollutant registry and grouped emissions into categories such as heavy metals, pesticides, chlorinated solvents, persistent organic pollutants, and other organic or inorganic pollutants.
A previous analysis by Zhao and colleagues in the same cohort had not implicated air pollution, according to MedPage Today; water pollution had not been measured in that work. For the current analysis, the researchers also examined 2010 registry data. The report said heavy metals, other organic pollutants and other inorganic pollutants retained significant associations then, while chlorinated solvents also met the study’s significance threshold.
PSP diagnoses were identified through health-record coding, rather than described as individually confirmed diagnoses. The study population’s mean age was 63; about 41% were women and 91% were British. The relatively small number of PSP cases limits how precisely the findings can identify particular exposures.
“There is also evidence that the length of time people lived near the polluting facilities played a role in their risk of PSP.”
— Charlie Weige Zhao, MD, of Harvard Medical School, as quoted in a statement
Limits of the Exposure Evidence
The study cannot show that pollution from a nearby facility caused PSP. Researchers used residential proximity and facility reports as indicators of exposure; the source material does not describe individual measurements of pollutants in participants’ water or bodies. People may also have moved, encountered pollution elsewhere or had different exposure levels despite living similar distances from a site.
The researchers acknowledged that health-record coding could lead to misclassified PSP diagnoses. Residual confounding, including participants’ occupational histories, may have influenced the results. Because many facilities emitted more than one pollutant, the associations for specific substances are exploratory and cannot confidently identify which pollutant, if any, is responsible. The study also does not establish a safe distance from a facility or quantify any person’s absolute risk.
Further Studies Needed
The researchers and outside expert quoted in the report called for more epidemiological and laboratory research to investigate possible causes of PSP. Follow-up work could test whether the associations hold in other populations, improve exposure estimates, account for work and residential histories, and distinguish pollutants that often occur together.
The report does not announce a planned public-health intervention or provide a timeline for further results. Until stronger evidence is available, the finding remains an observational association; whether particular water pollutants contribute to PSP, and through what exposure pathway, is still unresolved.
Key Questions
What is progressive supranuclear palsy?
PSP is a rare, progressive neurodegenerative disorder. It can affect movement, balance and eye movements. The source report says there is currently no treatment that effectively stops or slows its progression.
What did the study find about pollution?
In a comparison of 221 PSP cases and 2,249 controls, living nearer facilities reporting certain pollutants was associated with higher odds of PSP. Associations were reported for heavy metals, pesticides, and other organic and inorganic pollutants. The study did not prove that exposure caused the disease.
Does living near an industrial facility mean someone will develop PSP?
No. The findings describe group-level statistical associations, not an individual prediction. The study does not give a person’s absolute risk or establish a distance at which risk changes.
What are the main limitations of the research?
Researchers relied on facility records and residential proximity rather than direct personal exposure measurements. They also noted possible diagnostic coding errors, residual confounding such as occupation, and the difficulty of separating pollutants because facilities often emitted several types.
Source: medpagetoday.com
