Prenatal Wildfire Smoke Linked to Autism Risk
A Rutgers study of nearly 900,000 U.S. mother-child pairs links prenatal exposure to fine wildfire smoke particles with higher autism diagnosis rates.
Updated on Nov. 7, 2026 in Asthma
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Researchers at Rutgers University found that children exposed to higher levels of fine particulate matter from wildfire smoke during pregnancy were more likely to later be diagnosed with autism. The study, published in JAMA Pediatrics, analyzed Medicaid records across the United States.
Why it matters
Wildfire smoke is a growing exposure as climate change is expected to increase wildfire frequency. The findings add to evidence that prenatal air pollution may affect neurodevelopment, though the study is observational and further research is needed to confirm the association.
The observational analysis of Medicaid records covering almost 900,000 mother-child pairs found autism risk rose 30% for each incremental increase in air pollution, with the strongest effect in the second and third trimesters. Whether the link is causal remains unconfirmed, and additional studies are needed.
The players
Rutgers University
A public research university in New Jersey whose researchers conducted the study on prenatal wildfire smoke and autism risk.
JAMA Pediatrics
A peer-reviewed medical journal published by the American Medical Association that carries research on child health.
The details
Researchers combined Medicaid health insurance records with modeled estimates of weekly wildfire smoke concentrations where each pregnant person lived. The fine particles involved, known as PM 2.5, are 30 times smaller than the width of human hair and can settle deep in the lungs and enter the bloodstream.
Timeline
Births in the study cohort occurred between 2007 and 2014.
Smoky air from Canadian wildfires affected the Philadelphia region for five days in 2023.
The Rutgers study was published on November 7, 2026.
Health Landscape
The New Jersey Department of Health reported a spike in emergency room visits for new asthma diagnoses after the 2023 wildfire smoke, showing respiratory harm from smoke was already documented. The Rutgers autism findings extend that pattern to prenatal exposure and possible effects on brain development.
Pregnant people in areas affected by wildfire smoke may want to ask their health care providers about reducing exposure to fine particles. The study does not establish that exposure causes autism, so these findings should be weighed against the need for further research.
The takeaway
Wildfire smoke can travel far beyond the fire itself, reaching cities hundreds of miles away and affecting pregnancies. Limiting time outdoors and using indoor air filtration during smoky periods are practical steps people can take to reduce exposure.
Further reading
Explore more on Asthma to see how air pollution and wildfire smoke affect respiratory health across the country.
Source note: This article includes information reported by WHYY.
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