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[Preprint]. 2023 Jun 7:rs.3.rs-3026552.
doi: 10.21203/rs.3.rs-3026552/v1.

Effects of In-Utero Personal Exposure to PM2.5 Sources and Components on Birthweight

Karl O'Sharkey  1 , Yan Xu  1 , Jane Cabison  1 , Marisela Rosales  1 , Tingyu Yang  1 , Thomas Chavez  1 , Mark Johnson  1 , Deborah Lerner  2 , Nathana Lurvey  2 , Claudia M Toledo Corral  3 , Shohreh F Farzan  1 , Theresa M Bastain  1 , Carrie V Breton  1 , Rima Habre  1
Affiliations

Effects of In-Utero Personal Exposure to PM2.5 Sources and Components on Birthweight

Karl O'Sharkey et al. Res Sq. .

Update in

Abstract

Background: In-utero exposure to fine particulate matter (PM2.5) and specific sources and components of PM2.5 have been linked with lower birthweight. However, previous results have been mixed, likely due to heterogeneity in sources impacting PM2.5 and due to measurement error from using ambient data. Therefore, we investigated the effect of PM2.5 sources and their high-loading components on birthweight using data from 198 women in the 3rd trimester from the MADRES cohort 48-hour personal PM2.5 exposure monitoring sub-study.

Methods: The mass contributions of six major sources of personal PM2.5 exposure were estimated for 198 pregnant women in the 3rd trimester using the EPA Positive Matrix Factorization v5.0 model, along with their 17 high-loading chemical components using optical carbon and X-ray fluorescence approaches. Single- and multi-pollutant linear regressions were used to evaluate the association between personal PM2.5 sources and birthweight. Additionally, high-loading components were evaluated with birthweight individually and in models further adjusted for PM2.5 mass.

Results: Participants were predominately Hispanic (81%), with a mean (SD) gestational age of 39.1 (1.5) weeks and age of 28.2 (6.0) years. Mean birthweight was 3,295.8g (484.1) and mean PM2.5 exposure was 21.3 (14.4) μg/m3. A 1 SD increase in the mass contribution of the fresh sea salt source was associated with a 99.2g decrease in birthweight (95% CI: -197.7, -0.6), while aged sea salt was associated with lower birthweight (β =-70.1; 95% CI: -141.7, 1.4). Magnesium sodium, and chlorine were associated with lower birthweight, which remained after adjusting for PM2.5 mass.

Conclusions: This study found evidence that major sources of personal PM2.5 including fresh and aged sea salt were negatively associated with birthweight, with the strongest effect on birthweight from Na and Mg. The effect of crustal and fuel oil sources differed by infant sex with negative associations seen in boys compared to positive associations in girls.

Keywords: Air Pollution; Birthweight; PM2.5; Personal Monitoring; Pregnancy; Prenatal Exposure.

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Conflict of interest statement

Competing Interests The authors declare no competing interests.

Figures

Figure 1
Figure 1
Associations Between High-Loading Components of the Six Personal PM2.5 Sources and Birthweight in Single-Pollutant Models, Adjusting for Personal PM2.5 Mass Concentration, and Using the Component Residuals as the Main Exposure, Respectively. Notes: PM2.5 = particulate matter with an aerodynamic diabetes less than 2.5μm; significance < 0.05; β = change in birthweight per 1 SD increase in pollutant; adj = adjusting; all models were adjusted for gestational age at birth, maternal age, race/ethnicity, infant sex, parity, diabetes status, temperature, maternal education, and personal smoking history.
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