Roads and air pollution track neurologic disease
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.
Source
Road proximity, air pollution, noise, green space and neurologic disease incidence: a population-based cohort study
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
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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.
What they did
Administrative cohorts assigned residential road proximity, land-use-regression air pollutants, modeled noise, and NDVI greenness, then estimated HRs/ORs for incident neurologic disease.
What they found
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.
The limits
What it doesn't show
Case ascertainment from health records can misclassify subtypes; residual spatial confounding and correlated traffic co-exposures limit causal claims for any single pollutant.
Key terms
- NAD
- Non-Alzheimer’s dementia as coded in administrative records.
- Road proximity
- Living near a major road or highway as a traffic-exposure proxy.
- NDVI greenness
- Satellite vegetation index in a 100-m residential buffer.
- Lden noise
- Day–evening–night weighted environmental noise.
- Black carbon
- Traffic-related combustion particle estimated by land-use regression.
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Quiz yourself
Road proximity was linked to higher incidence of:
Common questions
Which diseases rose near roads?
NAD, PD, AD, and MS incidence.
Did noise explain the associations?
No—noise impacts were generally null.
Did greenness matter?
It attenuated road-proximity associations, especially for AD.
Air pollution vs AD/MS?
Linked to NAD and PD, not AD or MS.
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