A new University of Arizona study is putting farm country under the microscope, finding that women who lived near agricultural pesticide applications in the three months before conception were more likely to have babies with lower five minute Apgar scores. The large, statewide analysis points to the preconception period as a particularly sensitive window for exposures that may influence newborn health. For families living near fields, it adds fuel to long running debates about spraying schedules and buffer zones around homes and workplaces.
What the study found
The peer reviewed paper examined more than 1.1 million Arizona births between 2006 and 2020 and defined exposure as living within roughly 500 meters of an agricultural pesticide application during a 90 day preconception window or at any point during pregnancy. Researchers reported higher odds of low five minute Apgar scores, defined in the analysis as less than 8, for several specific active ingredients. Those included the carbamates carbaryl and formetanate hydrochloride, the organophosphates diazinon and tribufos, and the pyrethroid cypermethrin. The authors used adjusted log binomial regression and a meta analytic approach to account for maternal and newborn characteristics, according to Journal of Exposure Science & Environmental Epidemiology.
How researchers linked spraying to births
The team connected Arizona's pesticide use registry with state birth certificates, then mapped maternal addresses in relation to documented agricultural applications. That linkage, along with earlier work by the same group, supported a prior University of Arizona paper that associated preconception and early pregnancy pesticide exposure with stillbirth risk, according to University of Arizona Health Sciences. Arizona's unusually detailed reporting system is key here. The Phoenix bureau at Axios Phoenix notes that the state is one of only two in the country with that level of pesticide use tracking, a rarity that makes this sort of analysis possible.
Why a low Apgar matters
The five minute Apgar score is a quick bedside check of a newborn's heart rate, breathing, muscle tone, reflexes and skin color, used to identify babies who may need closer observation or immediate support. On its own, a single low score does not seal any individual child's long term fate. Still, professional guidance holds that lower scores across a population are linked with increased risk for some adverse outcomes and should prompt follow up and careful monitoring, according to the American College of Obstetricians and Gynecologists.
Next steps and practical advice
Axios Phoenix reports that the research team now plans to dig into Medicaid records to see whether preconception pesticide exposures are associated with neurodevelopmental disorders as children grow. If those links show up, it would connect a delivery room measure like the Apgar score with longer term diagnoses and could sharpen calls for targeted public health action. In the meantime, federal occupational health guidelines already nudge people toward caution. The reproductive health guidance from the National Institute for Occupational Safety and Health advises pregnant workers to avoid pesticide duties when possible, limit direct application, use appropriate protective equipment and speak with employers and health care providers about ways to reduce contact. Those same precautions may be worth discussing for people who are planning a pregnancy and living next to sprayed fields, according to the CDC.
What this means for Arizona families
Published on March 13, 2026, the paper, led by researchers Audrey Yang, Paloma Beamer and Melissa Furlong, adds to growing evidence that neighborhood level pesticide exposure before and during pregnancy can affect newborn health. It also highlights how Arizona's detailed reporting system allows scientists to generate data that could influence policy on how, when and where pesticides are sprayed, the size of buffer zones and protections for workers and nearby residents. The analysis appears in Journal of Exposure Science & Environmental Epidemiology, and the authors report that additional follow up on childhood development is already in the works.
