Flutterby™! : Transport noise

Guardian: Transport noise linked to increased risk of dementia, study finds

BMJ: Residential exposure to transportation noise in Denmark and incidence of dementia: national cohort study

Results The study population included 103 500 participants with incident dementia, and of those, 31 219 received a diagnosis of Alzheimer’s disease, 8664 of vascular dementia, and 2192 of Parkinson’s disease related dementia. Using Cox regression models, 10 year mean exposure to road traffic and railway noise at the most (L_denmax) and least (L_denmin) exposed façades of buildings were associated with a higher risk of all cause dementia. These associations showed a general pattern of higher hazard ratios with higher noise exposure, but with a levelling off or even small declines in risk at higher noise levels. In subtype analyses, both road traffic noise and railway noise were associated with a higher risk of Alzheimer’s disease, with hazard ratios of 1.16 (95% confidence interval 1.11 to 1.22) for road L_denmax ≥65 dB compared with <45 dB, 1.27 (1.22 to 1.34) for road L_denmin ≥55 dB compared with <40 dB, 1.16 (1.10 to 1.23) for railway L_denmax ≥60 dB compared with <40 dB, and 1.24 (1.17 to 1.30) for railway L_denmin ≥50 dB compared with <40 dB. Road traffic, but not railway, noise was associated with an increased risk of vascular dementia. Results indicated associations between road traffic L_denmin and Parkinson’s disease related dementia.

Via this Twitter thread which has a bunch of other studies linking transport and traffic noise to negative health effects.