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A study of UK Biobank participants found that living nearer to facilities reporting water pollutants was associated with a higher risk of progressive supranuclear palsy (PSP). The observational findings do not establish that pollution caused the disorder, and the researchers cite possible misdiagnosis, unmeasured factors and overlapping emissions as limitations.
A study using UK Biobank data found that people living closer to industrial facilities reporting certain pollutants were more likely to receive a diagnosis of progressive supranuclear palsy (PSP), a rare neurodegenerative disorder. The researchers reported associations, not proof that pollution caused the disease, and said several limits in the data make the findings exploratory.
The analysis included 221 people diagnosed with PSP between 2007 and 2025 and 2,249 matched controls without a recorded diagnosis of parkinsonism or dementia. Researchers compared participants’ baseline home locations with nearby facilities listed in the European Pollutant Release and Transfer Register, including wastewater treatment plants, chemical plants, intensive aquaculture operations and thermal power stations.
Proximity to facilities reporting heavy metals, pesticides, other organic pollutants and other inorganic pollutants was associated with higher odds of PSP. Reported odds ratios were 1.38 for heavy metals, 1.66 for pesticides, 1.52 for other organic pollutants and 1.60 for other inorganic pollutants. The researchers also found that risk generally declined as distance from facilities increased. These figures describe associations in the study; they do not establish an individual’s absolute risk or show that a specific pollutant caused a diagnosis.
In an analysis using 2010 facility reports, the researchers said associations remained for heavy metals and the two broad organic and inorganic pollutant categories, while chlorinated solvents also met their threshold for statistical significance. Several pollutant types were emitted by the same facilities, making it difficult to separate their effects. The study was reported by MedPage Today on October 28, 2026.
Why PSP Exposure Findings Matter
PSP can affect movement, balance and eye movements, and there is currently no treatment that effectively stops or slows its progression, according to the report. Identifying environmental factors that may contribute to the disease could help researchers decide what exposures to investigate and, if a causal link is established in future work, inform prevention efforts.
The results also point to a possible role for exposure through water or ingestion, rather than air pollution alone. That is a research lead, not a basis for concluding that residents near any particular facility are at risk. The study measured proximity to reporting facilities and used pollutant categories; it did not demonstrate what participants personally consumed or establish a dose-response relationship for a specific chemical.
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How Researchers Tracked Facility Proximity
The work builds on earlier research by the same team using the UK Biobank cohort. That earlier analysis did not implicate air pollution in the cohort, but did not measure water pollution, according to the report. The new analysis used industrial-facility reporting data to examine whether residential proximity was associated with incident PSP diagnoses.
Researchers used 2007, the earliest year of full UK Biobank recruitment, as their index reporting year. There were 305 reporting facilities in that year, and co-emission of pollutants, particularly heavy metals, was common. The study population’s mean age was 63; about 41% were women and 91% were British. Those details describe this particular cohort and do not necessarily reflect people with PSP generally.
PSP is a progressive movement disorder, also described as a neurodegenerative tauopathy. Its symptoms can include parkinsonism, problems moving the eyes and balance difficulties. The study identified cases through diagnostic coding, rather than confirming each diagnosis through a separate clinical examination.
“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, quoted in a statement
Limits of the Pollution Analysis
The study is observational, so it cannot show that exposure to pollutants caused PSP. The researchers acknowledged that diagnoses based on coding could include misclassified cases, and that residual confounding may have affected the results. Participants’ occupation histories, for example, could influence exposure but were not fully accounted for in the analysis described in the report.
Residential distance is not a direct measure of exposure: the analysis does not establish what pollutants reached a person’s water supply, how much they encountered or whether they consumed contaminated water. Because many facilities emitted more than one pollutant, the researchers said estimates for specific pollutants should be treated as exploratory. The report does not provide evidence that any one facility or pollutant caused an individual case.
Further Studies Must Test Exposure
The immediate next step is further research to test whether the reported associations hold in other populations and with better measures of individual exposure. Researchers would need to distinguish among pollutants emitted together and account for factors such as work history, residential history and actual water exposure.
Laboratory studies could also help examine whether particular contaminants have biological effects relevant to PSP. Until those questions are addressed, the findings are best understood as a signal for further investigation, not evidence that living near a listed facility causes the disorder or a reason to infer personal risk from address alone.
Key Questions
What is progressive supranuclear palsy?
PSP is a rare, progressive neurodegenerative disorder that can cause parkinsonism, eye movement problems and difficulty with balance. The report says there is no treatment that effectively stops or slows its progression.
Did the study prove water pollution causes PSP?
No. The researchers found associations between proximity to facilities reporting certain pollutants and PSP diagnoses. An observational study cannot establish that pollution caused the disease, and proximity is not a direct measure of a person’s exposure.
Which pollutants were associated with higher odds of PSP?
The reported associations involved facility emissions of heavy metals, pesticides, other organic pollutants and other inorganic pollutants. The researchers cautioned that facilities often emitted multiple pollutant types, so results for specific categories are exploratory.
How many people were included in the analysis?
The study compared 221 PSP cases with 2,249 matched controls in the UK Biobank. Diagnoses were identified through coding, and the researchers said misdiagnosis was possible.
What further evidence is needed?
Further studies need to measure individual exposure more directly, separate pollutants that are released together and account for possible confounding factors. Laboratory research may also help test whether particular contaminants could contribute to disease processes.
Source: rss
