The UC Davis Primate Research Center followed 45 female macaques who conceived when smoke pollution levels were high and 20 female macaques who conceived when air quality had returned to normal. Out of the 45 exposed monkeys, seven miscarried. However, the 20 macaques not exposed to smoke during pregnancy all had successful live births.
Lead author of the study, Dr. Bryn Wilson, said that this could mean pregnant women are more susceptible to the impacts of smoke in our air.
"I would consider them being sort of a sensitive group, similar to the way we categorize our patients with asthma or other lung conditions," she told KCBS Radio.
On smoky or hazy days, Wilson recommends that women who are expecting wear an N95 mask if they need to spend a significant amount of time outdoors, and for short periods of time, wear a traditional surgical mask. She specified that women in their first trimester should take the most precaution when facing wildfire smoke.
The UC Davis study supports evidence doctors have already collected proving that smoke exposure is harmful during pregnancy.
"We already have evidence that exposure can lead to lower birth weight and can lead to preterm births," said Dr. Vinayak Jha, a pulmonologist at California Sutter’s Pacific Medical Center in San Francisco. This study helps to verify that work.