Fig. 3
From: Maternal PM2.5 exposure triggers preterm birth: a cross-sectional study in Wuhan, China
Distribution of months of conception for participants and individual PM2.5 exposure in the specific trimester. Notes: The height of the bar indicates the number of participants. The dot indicates the woman who exposure to a specific PM2.5 concentration. The density plot on the right marginal of y-axis visualizes the distribution of the number of subjects over the PM2.5 concentration intervals