A new study links exposure to wildfire smoke during late pregnancy to a modestly increased risk of autism in children [[1]]. Researchers analyzed data from over 200,000 births in Southern California between 2006 and 2014, finding a correlation between smoke exposure – particularly during the third trimester – and autism diagnoses by age five [[2]], [[3]]. while the research does not establish a causal link, the findings add to a growing body of evidence highlighting the potential impact of air pollution on fetal growth and emphasize the importance of protecting pregnant individuals during periods of heightened air quality risk.
Exposure to wildfire smoke during the later stages of pregnancy may be linked to an increased risk of autism in children, according to a new study. The findings highlight the potential impact of air pollution on fetal brain development and underscore the importance of protecting vulnerable populations during environmental events.
Researchers analyzed data from over 200,000 births in Southern California between 2006 and 2014, including 3,356 cases where children were diagnosed with autism before the age of five.
The study found that pregnant individuals exposed to wildfire smoke particles for one to five days during their third trimester were more likely to have children diagnosed with autism compared to those who weren’t exposed. Researchers published their findings in the journal Environmental Science & Technology.
The risk was even greater for mothers exposed to wildfire smoke for more than 10 days during the last trimester. In these cases, the likelihood of a child receiving an autism diagnosis increased by 23% compared to children of mothers who had no smoke exposure during pregnancy.
During wildfires, burning vegetation and structures release toxic metals and other pollutants that can be inhaled. Researchers noted that these airborne particles may contribute to developmental issues.
Other factors that increased risk included advanced maternal age, being a first-time mother, or having pre-existing diabetes or obesity before pregnancy.
The researchers emphasize that their study does not prove that wildfire smoke exposure causes autism, but it adds to a growing body of evidence suggesting that air pollution can negatively impact fetal brain growth. Further research is needed to fully understand the connection and develop preventative strategies.
