Air pollution
Roads and air pollution track neurologic disease
Open access · cc by · source: Europe PMC
In Metro Vancouver, living near roads raised incidence of non-Alzheimer dementia, Parkinson’s, Alzheimer’s, and MS; air pollution linked to NAD and PD, noise was null.
How this study connects
Role on claims
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An administrative neurologic cohort reported 13,170 non-Alzheimer dementia, 4,201 Parkinson, 1,277 Alzheimer and 658 MS cases. Road proximity raised risks; greenness attenuated NAD/PD HRs by 0.3–6.2% and AD ORs by 11–28%. Air pollution associated with NAD and PD, not AD or MS; noise effects were generally null — diagnosis-specific binary/survival models, not one 'neurologic OR'.
Evidence for the claim as stated.
LUR air pollutants are often one layer in a correlated traffic bundle. An administrative cohort assigned road proximity, LUR pollutants, modelled noise and NDVI greenness: 13,170 non-Alzheimer dementia, 4,201 Parkinson, 1,277 Alzheimer and 658 MS cases. Road proximity raised risks; greenness attenuated some HRs/ORs; LUR air pollution associated with NAD and PD, not AD or MS; noise was generally null.
Evidence for the claim as stated.
These papers do not agree on which traffic-related layer carries the signal. Rome’s analysis is built on NO₂ LUR as the exposure; the neurologic cohort finds air pollution associated with some diagnoses and not others, with greenness attenuating and noise mostly null; the LA preterm paper’s PAH signal is limited by two stations and shorter sampling. Treating 'LUR showed pollution is bad' as a single result hides those splits.
Evidence for the claim as stated.
Open questions
Tensions this paper is part of
From concept pages' “where studies disagree.” Disagreement means the same question; scope means different assays, populations, or outcomes.
These papers do not agree on which traffic-related layer carries the signal. Rome’s analysis is built on NO₂ LUR as the exposure; the neurologic cohort finds air pollution associated with some diagnoses and not others, with greenness attenuating and noise mostly null; the LA preterm paper’s PAH signal is limited by two stations and shorter sampling. Treating 'LUR showed pollution is bad' as a single result hides those splits.
Study at a glance
- Design
- Cohort — Metro Vancouver administrative cohorts of adults 45–84 linking roads/pollution/noise/greenness to neurologic incidence
- N
- NAD/PD cohorts ~7.3–7.4 million person-years; 13,170 NAD, 4,201 PD, 1,277 AD, 658 MS cases — exact unique-person N not a single primary figure
- Population
- Adults aged 45–84 in Metro Vancouver with provincial health coverage
- Outcome
- Incident non-Alzheimer dementia, Parkinson’s, Alzheimer’s, and MS
Structured fields used in claim comparison tables when every cited study has a complete layer.
Inspect source passages
Roads and air pollution track neurologic disease
These passages occur verbatim in the stored paper text. They support the points listed below; they do not verify every statement in the explanation.
13,170 incident NAD cases were identified.
During the follow-up period, we identified 13,170 incident cases of NAD, 4201 incident cases of PD, 1277 incident cases of AD and 658 incident cases of MS.
NAD and PD cohorts comprised 7.3 and 7.4 million person-years.
The NAD and PD cohort comprised 7.3 and 7.4 million person-years of observations.
Key findings
13,170 NAD, 4,201 PD, 1,277 AD, and 658 MS cases. Road proximity raised risks; greenness attenuated NAD/PD HRs by 0.3–6.2% and AD ORs by 11–28%. Air pollution associated with NAD and PD, not AD or MS; noise effects were generally null.
Methodology
Administrative cohorts assigned residential road proximity, land-use-regression air pollutants, modeled noise, and NDVI greenness, then estimated HRs/ORs for incident neurologic disease.
Limitations
Case ascertainment from health records can misclassify subtypes; residual spatial confounding and correlated traffic co-exposures limit causal claims for any single pollutant.
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