A recent study indicates that exposure to wildfire smoke and heat stress prior to and during pregnancy may lead to negative birth outcomes.
The researchers highlighted that the connection between these exposures was especially pronounced during the month preceding conception and in the early weeks of pregnancy, as noted in their findings published in Environmental Science Technology.
“It’s well-established that poor air quality results in adverse health effects, and pregnant women, as well as their unborn children, are particularly at risk,” stated Prime Minister Roxana Kariri, a postdoctoral researcher from the University of Southern California.
Despite this knowledge, she explained that there’s still a gap in understanding the specific impacts of wildfire smoke related to pregnancy.
The study identified several concerning birth outcomes, including babies born smaller than expected for their gestational age—infants with birth weights below the 10th percentile.
Lower birth weight can heighten the risk for immediate health issues like hypoxia, along with potential long-term complications ranging from metabolic issues to cognitive and developmental disorders, as previous research has shown.
Additionally, the findings suggested that residing in areas affected by climate disturbances may elevate the risks of having smaller babies, particularly for women exposed to heat stress before conception.
“Where you live significantly impacts your health, as does the timing of exposure during or just before pregnancy,” Kariri remarked.
To reach these conclusions, Kariri and her team analyzed data from 713 births occurring between 2016 and 2020 from the Madres cohort.
They utilized data from Calfire to pinpoint wildfire locations, sizes, and durations in Southern California during that timeframe.
Furthermore, they employed the National Ocean and Atmospheric Administration’s hazard mapping system to gauge smoke densities from each fire, applying advanced models to predict the levels of particulate exposure for the cohort participants.
For assessing heat stress related to pregnancy’s effect on body temperature regulation, they relied on daily weather data regarding temperature, humidity, and wind speed.
The Los Angeles area was highlighted as particularly susceptible to climate-related vulnerabilities, demonstrated through both state and federal assessments.
Khalili expressed hope that these findings would inform both residents and policymakers on how to navigate prolonged fire seasons effectively.
“By understanding how wildfires and extreme heat days affect women, we can identify protective measures, formulate guidance, and strategize interventions,” she stated.
However, she emphasizes that future strategies should go beyond individual actions like staying indoors or using air conditioning.
Thus, a comprehensive approach is necessary that boosts adaptive capacities in communities and strengthens resilience against shifting climate conditions.
Lima Harbor, director of USC’s Clima Center, remarked, “The recent fires in Los Angeles illustrate how infrastructure, health vulnerabilities, and socioeconomic factors, combined with extreme climate stressors, can exacerbate health risks.”
“A thorough assessment of the cumulative impacts our communities face today, as well as those in the future, is essential for accurately assessing the health risks associated with climate change and for developing targeted interventions that promote community resilience,” Harber concluded.
