Can wildfire smoke exposure during pregnancy cause autism?

A study suggests an association between wildfire smoke exposure in late pregnancy and a higher chance of autism diagnosis in children, but it does not prove causation.

What specific components of wildfire smoke are concerning for pregnant women?

Researchers focused on PM 2.5 particles, which are tiny particles in wildfire smoke that can enter the lungs and bloodstream.

When is the most critical period for wildfire smoke exposure during pregnancy according to the study?

The study found the strongest link when exposure occurred during the third trimester, a critical period for fetal brain development.

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Wildfire Smoke Linked to Autism Risk in Babies

21 Jan

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Summary

Wildfire smoke exposure in late pregnancy may increase autism risk.
Third-trimester exposure showed the strongest link to childhood autism.
Study focused on PM 2.5 particles found in wildfire smoke.

Wildfire Smoke Linked to Autism Risk in Babies

A recent study of over 200,000 births in Southern California has indicated a potential link between prenatal exposure to wildfire smoke and an increased risk of autism in children. The research, published on January 20, 2026, specifically highlights the third trimester of pregnancy as a critical period.

During the final three months of gestation, when fetal brain development is rapid, exposure to PM 2.5 particles from wildfire smoke was associated with a higher chance of autism diagnosis. This association was particularly notable when smoke exposure occurred over several consecutive days.

The study's findings suggest that ongoing exposure to wildfire smoke during pregnancy may be more influential than sporadic exposure. While the study does not establish a direct cause, it adds to a growing body of evidence connecting prenatal air pollution exposure to neurodevelopmental conditions.