Fig. 2From: Effect of ambient air pollution on premature SGA in Changzhou city, 2013–2016: a retrospective studyLocation of monitoring sites and subjects. Six monitoring sites and 2709 pregnant women with premature births were marked by red pentagrams and black solid dots, respectively. The map was generated by the professional software (ARCGIS, version 10.3; ESRI, Redlands, CA, USA)Back to article page