Prenatal Air Pollution Exposure and Autism Spectrum Disorder in the ECHO Consortium

Area of Science:

• Environmental Health
• Pediatric Neurodevelopment
• Epidemiology

Background:

• The link between low-level prenatal air pollution exposure and autism spectrum disorder (ASD) remains insufficiently understood.
• Investigating environmental factors during pregnancy is crucial for understanding ASD etiology.

Purpose of the Study:

• To investigate the association between prenatal exposure to fine particulate matter (PM2.5), nitrogen dioxide (NO2), and ozone (O3) and autism-related traits and diagnoses.
• To analyze data from a large, diverse cohort of mother-child pairs across the United States.

Main Methods:

• Utilized data from 8,035 mother-child pairs in the Environmental influences on Child Health Outcomes (ECHO) Cohort.
• Estimated air pollutant levels (PM2.5, NO2, O3) at residential addresses during pregnancy.
• Assessed autism-related traits using the Social Responsiveness Scale (SRS) and physician-diagnosed ASD, analyzing associations via quantile and logistic regression, pooled through meta-analysis across census divisions.

Main Results:

• Higher PM2.5 exposure was associated with elevated SRS scores at the 10th quantile.
• Ozone (O3) exposure showed associations with higher SRS scores at the median and highest quantiles, and with ASD diagnosis.
• Associations between PM2.5 and NO2 with ASD outcomes and traits varied significantly across different U.S. census divisions, indicating regional heterogeneity.

Conclusions:

• Prenatal exposure to air pollutants, even at low levels, is associated with autism spectrum disorder (ASD) outcomes.
• Ozone (O3) and fine particulate matter (PM2.5) are key pollutants of concern for potential neurodevelopmental impacts.
• Environmental influences on child health outcomes, including ASD, warrant further investigation and potential public health interventions.