TL;DR
Positive associations are found between short-term air pollution exposure, including PM and major PM2.5 components, and risks of early-term birth.
Background Prenatal PM2.5 exposure has been associated with preterm birth (PTB), but evidence on exposure windows and population heterogeneity remain inconsistent. Methods This retrospective cohort included 35,136 singleton births at a Chengdu hospital from 2015 to 2024. Satellite- and monitor-based PM2.5 exposures wer...
Prenatal exposure to NO₂, SO₂, and CO is associated with increased risks of PTB and SGA, and the importance of methodological refinement in environmental risk assessment to inform evidence-based air quality policies is highlighted.
It is suggested that, at the studied concentrations, short-term elevations in PM2.5 are unlikely to be associated with sPTB, underscoring the importance of continued surveillance of PM2.5-related health effects.
The findings provide evidence suggesting a potential association between maternal exposure to ambient carbon monoxide and preterm birth in this urban population in Tehran, and highlight the potential public health relevance of traffic-related CO exposure for pregnant women in highly polluted urban settings.
A nationwide cohort evidence for increased risk of stillbirth associated with prenatal NO2 exposure is provided, emphasizing the potential for stricter air quality regulations to reduce the stillbirth burden, particularly in LMICs.
The results suggest the importance of considering duration and magnitude in defining heat exposure to understand the effects of extreme heat on pregnancy and suggest a need for improved comparability of heatwave definitions as climate change continues to accurately assess their public health impacts.
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