Exposure to particulate matter (PM2.5) has emerged as a significant risk factor for depression, particularly among pregnant women. This systematic review and meta-analysis investigates the association between PM2.5 exposure and maternal depression during pregnancy, yielding a pooled relative risk of 1.29 (95% CI: 1.10–1.50) per 10 μg/m3 increase in PM2.5.
Exposure to particulate matter (PM2.5) has emerged as a significant risk factor for depression, particularly among pregnant women. This systematic review and meta-analysis investigates the association between PM2.5 exposure and maternal depression during pregnancy, adhering to PECO principles and PRISMA 2020 standards.
We searched PubMed, Google Scholar, and Science Open, identifying 231 records. After removing 49 duplicates, 182 studies were screened, excluding 110 via title/abstract review. Of 72 full texts assessed, 65 were excluded (48 for irrelevant outcomes, 14 for incompatible metrics, 3 for lacking PM2.5-specific data), yielding 7 studies (n = 576,737 pregnancies) for meta-analysis.
Using Cochran's Q and I² statistics (I² = 85.1%, τ² = 0.027), a restricted maximum likelihood (REML) random-effects model estimated a pooled relative risk (RR) of 1.29 (95% CI: 1.10–1.50) per 10 μg/m³ increase in PM2.5, indicating a 29% higher risk of depression. Subgroup analyses showed stronger effects across whole pregnancy (RR = 1.41, 95% CI: 1.23–1.63).
High heterogeneity (I² = 85.1%) and publication bias (Egger's p = 0.013) were noted. These findings highlight the impact of PM2.5 on maternal depression, urging further mechanistic studies, especially in low-income regions where data remains scarce.
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