• Djalma Antonio Almeida Dos Santos and Luiz Fernando Costa Nascimento.
• MSc. Doctoral Student, Postgraduate Program on Mechanical Engineering, Department of Energy, Universidade Estadual de São Paulo (UNESP), Guaratinguetá, Brazil.
• Sao Paulo Med J. 2019 Nov 1; 137 (6): 486490486-490.

BackgroundExposure to air pollutants has several effects on human health, including during pregnancy.ObjectiveTo identify whether exposure to benzene and toluene among pregnant women contributes to preterm delivery.Design And SettingLongitudinal study using data on newborns from mothers living in São José dos Campos (SP) in 2016, who had been exposed to benzene and toluene.MethodsA logistic regression model with three hierarchical levels was constructed using maternal variables relating to newborns, and using benzene and toluene concentrations in quartiles. Occurrences of cesarean births, twins or malformations were excluded. Maternal exposure windows of 5, 10, 15, 30, 60 and 90 days prior to delivery were considered.ResultsOut of the 9,562 live births, 3,671 newborns were included and 343 newborns were born at less than 37 weeks of gestation (9.3%). The average birth weight was 3,167.2 g. Exposure to benzene and toluene was significantly associated (P = 0.04) with preterm delivery in the five-day window. There was no association in any of the other exposure windows.ConclusionsIt was possible to identify that maternal exposure to benzene and toluene has an acute effect on preterm delivery.

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