A study of more than 2.5 million pregnant people in California found that those exposed to wildfire smoke for at least one day faced a higher risk of giving birth prematurely.
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The results suggested that just one day of smoke exposure slightly raised the risk of spontaneous preterm birth — defined as before the 37th week of pregnancy. But the odds of preterm birth increased by 0.3% with each additional day of smoke exposure. Exposure was only associated with preterm birth within the first 20 weeks of pregnancy, however, not before conception.
Since smoke from fires in the West can travel thousands of miles, she added,"it’s not an isolated issue with the Western United States anymore." "Any abnormality at that stage, in the early stage of the development of the placenta, can cause a very long-term condition," he said. Waldrop said emerging evidence suggests wildfire smoke might be particularly harmful because it contains many different pollutants, including carbon monoxide.
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