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What Causes What
Lifestyle & environment

Nighttime transportation noise

dB Lnight

Outdoor sound from roads, trains, and aircraft at the home, usually as night-time Lnight. Fine particles at the same address are a different reading.

The papers estimate A-weighted night levels outside the façade, or distance to a road, rail line, or airport contour. Road, rail, and aircraft are the usual sources. The number is sound. Fine particles at the same address are air, not noise.

Also called traffic noise, aircraft noise, railway noise, environmental noise.

Connected relationships

SMOKE+ INCREASES

Meta-analysis · Low

Nighttime transportation noise→Major cardiovascular events

Higher Nighttime transportation noise increases Major cardiovascular events.

In a 2023 dose-response meta-analysis of 23 cohort papers and 18.5 million adults, mostly in Europe, each extra 10 dB of modelled road-traffic noise (as Lden) sat with a 2 percent higher risk of incident cardiovascular disease (RR 1.020, 1.006 to 1.035). Nobody randomized the street.

Read the full evidence

SMOKE− DECREASES

Meta-analysis · Low

Nighttime transportation noise→Sleep duration and regularity

Higher Nighttime transportation noise decreases Sleep duration and regularity.

In a 2022 update of the WHO sleep review, each extra 10 dB of night-time road, rail, or aircraft noise raised the odds of being highly sleep disturbed about two- to three-fold when the question named the noise, across 36 observational studies and 173,160 responses. Nobody randomized the street.

Read the full evidence

Sources