Abstract
Background Exposure to environmental stressors can impair children’s
health and their cognitive development. The effects of air pollution,
lead, and chemicals have been studied, but there has been less emphasis
on the effects of noise. Our aim, therefore, was to assess the effect
of exposure to aircraft and road traffic noise on cognitive performance
and health in children.
Methods We did a cross-national, cross-sectional study in which we
assessed 2844 of 3207 children aged 9–10 years who were attending
89 schools of 77 approached in the Netherlands, 27 in Spain, and
30 in the UK located in local authority areas around three major
airports. We selected children by extent of exposure to external
aircraft and road traffic noise at school as predicted from noise
contour maps, modelling, and on-site measurements, and matched schools
within countries for socioeconomic status. We measured cognitive
and
health outcomes with standardised tests and questionnaires administered
in the classroom. We also used a questionnaire to obtain information
from parents about socioeconomic status, their education, and ethnic
origin.
Findings We identified linear exposure-effect associations between
exposure to chronic aircraft noise and impairment of reading comprehension
(p=0·0097) and recognition memory (p=0·0141), and a non-linear association
with annoyance (p0·0001) maintained after adjustment for mother’s
education, socioeconomic status, longstanding illness, and extent
of classroom insulation against noise. Exposure to road traffic noise
was linearly associated with increases in episodic memory (conceptual
recall: p=0·0066; information recall:
p=0·0489), but also with annoyance (p=0·0047). Neither aircraft noise
nor traffic noise affected sustained attention, self-reported health,
or overall mental health.
Interpretation Our findings indicate that a chronic environmental stressor—aircraft
noise—could impair cognitive development in children, specifically
reading comprehension. Schools exposed to high levels of aircraft
noise are not healthy educational environments.
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