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Life sciences · Journal article
Ecotoxicology and Environmental Safety · August 15, 2026
Well-designed and adequately powered for the question it asks.
This large prospective cohort study demonstrates that prenatal PM2.5 exposure and its major chemical constituents (organic matter, ammonium, and nitrate) are independently and jointly associated with increased childhood overweight/obesity risk in the first two years of life. The associations are consistent across single-pollutant and mixture models, with narrow confidence intervals suggesting reliable effect estimates, though causation cannot be established from observational data.
Population-based prospective cohort study. Mother-child pairs from Liaoning Province, China; childhood overweight/obesity assessed across first two years of life. Intervention: Prenatal exposure to PM2.5 and five major chemical constituents (organic matter, black carbon, ammonium, nitrate, sulfate) estimated via atmospheric reanalysis. Compared with: Comparison across exposure quartiles in single-pollutant and mixture models. n = 339,435. Liaoning Province, China.
Prenatal PM2.5 total mass exposure (per IQR) associated with childhood OwOb: OR = 1.050 (95% CI: 1.036, 1.064) Organic matter constituent: OR = 1.058 (95% CI: 1.043, 1.072); ammonium: OR = 1.048 (95% CI: 1.035, 1.062); nitrate: OR = 1.048 (95% CI: 1.033, 1.064); black carbon: OR = 1.033 (95% CI: 1.020, 1.047) One-quartile increase in PM2.5 constituent mixture associated with OwOb: OR = 1.063 (95% CI: 1.050, 1.076), with organic matter contributing 54.1%, ammonium 34.4%, and nitrate 11.5% of mixture effects
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Clinicians and public health professionals should recognize prenatal PM2.5 exposure as a modifiable risk factor for early childhood obesity, with particular attention to organic matter, ammonium, and nitrate constituents. This suggests that maternal air quality monitoring and environmental interventions during pregnancy may help prevent metabolic disease in offspring.
Large prospective population-based study with 339,435 mother-child pairs using validated exposure assessment and quantile g-computation to evaluate PM2.5 constituents and childhood obesity, showing consistent dose-response associations across multiple pollutants with narrow confidence intervals.
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Clinicians and public health professionals should recognize prenatal PM2.5 exposure as a modifiable risk factor for early childhood obesity, with particular attention to organic matter, ammonium, and nitrate constituents. This suggests that maternal air quality monitoring and environmental interventions during pregnancy may help prevent metabolic disease in offspring.
Graded across the dimensions that decide whether you should act, each from what the source actually supports. There is no single score, and where a dimension was not assessed it says so.
A growing body of evidence links gestational fine particulate matter (PM 2.5 ) exposure to elevated childhood obesity risk, yet research on the combined impacts and respective contributions of different PM 2.5 chemical constituents remains limited. This large population-based prospective study involved 339,435 mother-child pairs from Liaoning Province, China. Prenatal exposure to PM 2.5 and five major chemical constituents (organic matter (OM), black carbon (BC), ammonium (NH₄⁺), nitrate (NO₃⁻), sulfate (SO₄²⁻)) was estimated using high-resolution atmospheric reanalysis data. Quantile g-computation (QGC) was used to investigate the joint associations of PM 2.5 chemical constituent mixtures and the relative contribution of each constituent with childhood overweight/obesity (OwOb) risk across the first two years of life. In single-pollutant models, prenatal exposure to PM 2.5 total mass (per interquartile range, odds ratio (OR) = 1.050, 95% confidence interval (CI): 1.036, 1.064) and four of the five chemical constituents (OM: OR = 1.058, 95% CI: 1.043, 1.072; NH₄⁺: OR = 1.048, 95% CI: 1.035, 1.062; NO₃⁻: OR = 1.048, 95% CI: 1.033, 1.064; and BC: OR = 1.033, 95% CI: 1.020, 1.047) were positively associated with increased risks of offspring OwOb. A one-quartile increase in the mixture of multiple PM 2.5 chemical constituents was associated with increased OwOb risk (OR = 1.063, 95% CI: 1.050, 1.076), with OM (54.1%), NH₄⁺ (34.4%), and NO₃⁻ (11.5%) acting as major contributors to the overall mixture effects. These findings underscore that regulating key PM 2.5 chemical constituents is a vital public health strategy to mitigate the adverse effects of prenatal air pollution on children’s metabolic health.
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