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Investigations on the potential effects of high air pollution exposure before pregnancy on adverse pregnancy outcomes are limited, and it is unknown whether air quality standards looser than that set by World Health Organization (WHO) still can provide sufficient protection pregnant women from adverse pregnancy outcomes. To evaluate the potential effects of high ambient air pollution around pregnancy on preterm birth (PT and low birth weight (LBW), and assess the risk of PTB and LBW associated with air pollutants with reference to dif