Accounting for overlapping exposures usually lowered estimated shares of deaths linked to them
Considering green space, air pollution and noise together usually weakened associations with death and lowered estimates of the share of deaths attributed to these exposures, compared with combining separate-exposure models.
Based on the published abstract. The full paper may contain additional methods, results and limitations.
The 30-second takeaway
Estimated associations with death generally became weaker when models accounted for another environmental exposure. Combining separate-exposure estimates also produced higher estimates of the share of deaths attributed to these exposures than models considering exposure pairs together. These observational, model-based findings suggest that overlapping exposures matter when estimating population health impacts, but they cannot establish how changing someone's surroundings would affect their survival.
Exposure levels and correlations varied substantially across studies. The abstract omits follow-up lengths and exposure increments needed to interpret the numerical mortality associations fully.
What researchers found
Modelled share of deaths attributed to exposures
Considering exposures in pairs produced lower estimates of the share of deaths attributed to them than combining models that considered each exposure separately. These are observational model estimates; exact follow-up lengths were not reported.
Why exposures were considered together
Green space, pollution and noise can be correlated in the studies being assessed. The review examined whether accounting for these relationships changed mortality estimates used in environmental health impact calculations.
Combined estimates remained higher than individual estimates
Even after accounting for exposure pairs, their combined estimated share of deaths attributed to exposures exceeded estimates for either exposure considered individually. This concerns a population-level calculation, rather than an observed benefit from changing an exposure.
The original publication
Exposure-response functions of the correlated environmental exposures green space, noise, and air pollution for quantifying mortality burden in health impact assessment.
Chen X, Gehring U, Dyer GMC et al.
Environ Int · 2025
- PubMed ID
- 40582334
- Record checked
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