Independent and combined effects of PM2.5 and its constituents on preterm birth: a retrospective study in a seaside city

AbstractMounting studies explored associations between fine particulate matter (PM2.5) and preterm birth (PTB); however, individual and combined impacts of PM2.5 constituents on PTB were less known. PM2.5 and its seven constituents were assessed by V4.CH.02 product of the Dalhousie University Atmospheric Composition Analysis Group, a dataset containing combined geophysical-statistical estimates of PM2.5 across China. Effects of PM2.5 and its constituents on PTB and gestational age were firstly explored. Furthermore, weighted quantile sum (WQS) regression was conducted to reveal the impacts of total PM2.5 mass and identify contributing constituents. An interquartile range (IQR) increase in PM2.5 was associated with increased odds ratio (OR) of PTB. PM2.5 constituents were widely associated with PTB and reduced gestational age, with different time window. The total mass of PM2.5 (per IQR increment) in the first and the second trimester was positively associated with PTB by WQS regression (Trimester 1: OR  = 1.38, 95%CI: 1.15, 1.65; Trimester 2: OR = 1.47, 95%CI: 1.21, 1.79). The most contributing factors were black carbon in the first trimester and sulphate ion in the second trimester, respectively. Especially, sea salt was identified as contributing constituent during the first trimester. T he study indicated that prenatal exposure to PM2.5 and its constituents was individually and jointly associated with PTB and reduced gestational age. Sea salt was firstly identified...
Source: Air Quality, Atmosphere and Health - Category: Environmental Health Source Type: research