SynthesisJournal of preventive medicine and public health = Yebang Uihakhoe chi2026
Association of Particulate Matter (PM2.5) With COVID-19 Infection and Mortality in Low-and Middle-income Asian Countries: A Systematic Review and Meta-analysis.
Synthesis in Journal of preventive medicine and public health = Yebang Uihakhoe chi, 2026. The graph could read no effect estimate from its abstract, so it casts no vote on the map. Not yet cited in PubMed.
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The abstract states no effect estimate the extractor could read, or names no intervention and outcome on the map, so this paper lights no cell and moves no belief. It is still indexed, cited and linked below.
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Abstract
objectivesLow-income and middle-income countries in Asia bear a disproportionate burden of particulate matter with an aerodynamic diameter of 2.5 micrometers or less (PM2.5) pollution, yet data remain scarce. This systematic review and meta-analysis aimed to quantify the association between PM2.5 exposure and the risks of coronavirus disease 2019 (COVID-19) infection and mortality in this vulnerable region.
methodsA systematic search was conducted in PubMed, Scopus, and other major databases for studies published up to December 31, 2024. We included observational studies reporting associations between PM2.5 and COVID-19 outcomes in low-income and middle-income Asian countries. Pooled effect sizes and 95% confidence intervals (CIs) were calculated using a random-effects model. The study was registered with PROSPERO (CRD42022316008).
resultsFourteen studies met the inclusion criteria. Separate analyses demonstrated statistically significant positive associations between PM2.5 exposure and COVID-19 infection for both short-term exposure (pooled risk ratio [RR], 1.12; 95% CI, 1.07 to 1.18) and long-term exposure (pooled RR, 1.41; 95% CI, 1.28 to 1.56). For mortality, the analysis identified a statistically non-significant positive association with short-term exposure (pooled RR, 1.37; 95% CI, 0.80 to 2.33). Substantial heterogeneity was observed across all analyses (I²>75%); however, sensitivity analyses confirmed that the findings for infection were robust.
conclusionsOur findings provide robust evidence that PM2.5 exposure is a significant risk factor for COVID-19 infection in low-income and middle-income Asian countries. The available evidence was insufficient to establish a clear association with mortality. These results underscore the urgent need for strengthened air quality control policies as a critical component of public health strategies to mitigate the burden of respiratory pandemics.
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