Long-Term Exposure to Fine Particulate Matter (PM_2.5) Components and Precocious Puberty Among School-Aged Children:...

Area of Science:

• Environmental Health
• Pediatric Endocrinology
• Epidemiology

Background:

• Precocious puberty incidence is rising in Chinese children, with limited understanding of risk factors.
• Ambient fine particulate matter (PM2.5) is a significant environmental hazard in China.
• PM2.5 components may act as endocrine disruptors, but population-based data on their link to precocious puberty is scarce.

Purpose of the Study:

• To investigate the association between long-term exposure to PM2.5 and its components with precocious puberty in Chinese children.
• To explore potential modifying effects of family and personal factors on this association.
• To identify the specific PM2.5 components contributing to precocious puberty.

Main Methods:

• Cross-sectional survey of 34,105 children (aged 6-9) across 30 Chinese cities (2017-2019).
• Assessed 5-year average PM2.5 concentrations and its components (sulfate, nitrate, ammonium, organic matter, black carbon) using spatial resolution data.
• Employed mixed-effect logistic regression and weighted quantile sum (WQS) regression to analyze associations and component contributions.

Main Results:

• Increased PM2.5 exposure showed a significant association with precocious puberty in girls (OR=2.12), but not in boys (OR=0.90).
• Organic matter was identified as the primary contributor to PM2.5's effect, accounting for 71% of the impact.
• Family income and dietary habits showed modifying effects in specific subgroups.

Conclusions:

• Long-term PM2.5 exposure is significantly linked to precocious puberty in girls, with organic matter as the main driver.
• Findings underscore the detrimental impact of PM2.5 on children's development and growth.
• Further research is needed to elucidate mechanisms and inform public health interventions.