Focal Interest
Focal Interest
AI Summary of Peer-Reviewed Research

This page presents an AI-generated summary of a published research paper. The original authors did not write or review this article. [See full disclosure ↓]

Publishing process signals: MODERATE — reflects the venue and review process. — venue and review process.

Ambient air pollution is linked to higher cardiovascular risk in LICs and LMICs

A wide-angle view of a congested urban intersection with numerous vehicles moving through a hazy, smog-filled street surrounded by tall buildings, with visible atmospheric pollution creating a misty appearance over the cityscape.
Research area:Environmental healthAir pollutionAir Quality and Health Impacts

What the study found

The study found positive associations between short-term exposure to several ambient air pollutants and cardiovascular disease (CVD) outcomes in low-income countries (LICs) and lower middle-income countries (LMICs). In the meta-analysis, PM2.5, PM10, and NO2 were each associated with increased combined mortality and hospital admission.

Why the authors say this matters

The authors say the findings matter because the burden of air pollution is higher in LICs and LMICs, yet most research has been done in higher-income countries. The study suggests there is a need for further research in underrepresented regions, especially on long-term exposure, to better establish the burden of air pollution on cardiovascular health.

What the researchers tested

The researchers systematically reviewed studies from PubMed and Global Health on daily changes in gaseous pollutants (SO2, NO2, CO, O3) and particulate matter in relation to adult CVD mortality and hospital admission. They assessed study quality using risk of bias criteria and used a random-effects model to estimate overall and pollutant-specific risks from short-term exposure studies, standardized to 10 μg/m3 increases.

What worked and what didn't

Out of 1,329 articles screened, 48 met the inclusion criteria, and 22 had relative-risk data suitable for meta-analysis. Short-term exposure to PM2.5 was associated with a 0.53% increase in combined mortality and hospital admission per 10 μg/m3, PM10 with a 1.68% increase, and NO2 with a 0.66% increase.

What to keep in mind

The review describes limited evidence on air pollution and CVD in LICs and LMICs. The abstract also notes that the meta-analysis was based on short-term exposure studies, and it does not report detailed limitations beyond the need for more research, particularly on long-term exposure.

Key points

  • The review focused on low-income and lower middle-income countries, where air pollution research is less common.
  • 48 studies met the review criteria, and 22 were included in the meta-analysis.
  • PM2.5, PM10, and NO2 were associated with increased cardiovascular mortality and hospital admission.
  • The reported increases were 0.53% for PM2.5, 1.68% for PM10, and 0.66% for NO2 per 10 μg/m3.
  • The authors call for more research, especially on long-term exposure in underrepresented regions.

Disclosure

Research title:
Ambient air pollution is linked to higher cardiovascular risk in LICs and LMICs
Authors:
Marvellous Adeoye, Natalie Evans, Shadi Rahimzadeh, Shreya Shrikhande, Sean Taylor, Pablo Perel, Anoop Shah, Mariachiara Di Cesare, Mark R. Miller
Institutions:
Imperial College Healthcare NHS Trust, London School of Hygiene & Tropical Medicine, London School of Hygiene & Tropical Medicine, University of Edinburgh, University of Essex, University of Essex, University of Essex, University of Essex, World Heart Federation, World Heart Federation, World Heart Federation
Publication date:
2026-03-30
DOI:
10.5334/gh.1545
OpenAlex record:
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AI provenance: This post was generated by gpt-5.4-mini (OpenAI). The original authors did not write or review this post.

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