Air pollution and cardiovascular disease.

Area of Science:

• Environmental Health
• Cardiovascular Science
• Toxicology

Background:

• Air pollution, particularly particulate matter (PM), is linked to cardiovascular disease.
• Inhalable particles (PM10) and fine particles (PM2.5, PM0.1) have varying impacts on the respiratory and circulatory systems.
• PM2.5 and PM0.1, primarily from fossil fuel combustion, pose significant health risks.

Purpose of the Study:

• To review the cardiovascular effects of particulate matter air pollution.
• To elucidate the biological mechanisms underlying PM-induced cardiovascular morbidity and mortality.
• To highlight the risks associated with fine and ultrafine particles, including engineered nanoparticles.

Main Methods:

• Review of experimental and epidemiological studies on air pollution and cardiovascular outcomes.
• Analysis of particle size, composition, and translocation into the systemic circulation.
• Examination of biological pathways, including oxidative stress, inflammation, and autonomic nervous system imbalance.

Main Results:

• PM exposure is consistently associated with acute and chronic cardiovascular effects.
• Ultrafine particles (PM0.1) can enter the bloodstream, directly impacting the heart and vasculature.
• Mechanisms include oxidative stress, inflammation, endothelial dysfunction, and autonomic imbalance, contributing to atherosclerosis, hypertension, and acute cardiovascular events.

Conclusions:

• Particulate matter air pollution is a major risk factor for cardiovascular morbidity and mortality.
• Fine and ultrafine particles exert adverse cardiovascular effects through multiple biological pathways.
• Emerging concerns exist regarding the cardiovascular risks of engineered nanoparticles.