Epidemiological Association Between Long-Term Fine Particulate Matter Exposure and Cardiovascular Disease: A...

Area of Science:

• Environmental Health
• Cardiovascular Epidemiology
• Public Health

Background:

• Air pollution, specifically fine particulate matter (PM2.5), is a significant environmental risk factor for cardiovascular diseases (CVD).
• Epidemiological studies consistently link long-term PM2.5 exposure to increased CVD mortality rates.
• Millions of premature deaths annually are attributed to air pollution's impact on cardiovascular health.

Purpose of the Study:

• To conduct a meta-analysis synthesizing existing estimates on the association between long-term PM2.5 exposure and cardiovascular diseases.
• To quantify the risk of CVD incidence and mortality associated with prolonged exposure to PM2.5.
• To investigate the specific impact of PM2.5 on ischemic heart disease (IHD) and stroke.

Main Methods:

• A systematic literature search was performed across PubMed, Embase, Web of Science, and Scopus following PRISMA guidelines, up to October 2025.
• A random-effects model was employed to pool Hazard Ratios (HRs).
• Heterogeneity among studies was assessed using the I-squared (I²) statistic.

Main Results:

• The meta-analysis included four studies, revealing a significant increased risk of CVD with long-term PM2.5 exposure (pooled HR=1.22, 95% CI: 1.06-1.41).
• No significant association was found between PM2.5 exposure and cardiovascular mortality (pooled HR=1.00, 95% CI: 0.71-1.41).
• While trends suggested increased risk for ischemic heart disease (IHD) (pooled HR=1.65) and stroke (pooled HR=1.61), these did not reach statistical significance in this analysis.

Conclusions:

• Long-term exposure to PM2.5 is associated with an elevated risk of cardiovascular diseases.
• The findings underscore the importance of implementing stringent air quality standards and targeted interventions to reduce population exposure.
• Further comprehensive research is needed to fully elucidate the complex relationship between PM2.5 and various cardiovascular outcomes.