Overview

The presence of small particles in the air and the surrounding environment can have severe effects on health; these particles are known as pollutants. The accumulation of pollutants is what leads to pollution. ⁽³⁾ Air pollution is caused by a variety of environmental sources, including fires, storms, vehicle emissions, dust, and more. While urban air pollution has been a major contributor, other significant sources include biomass burning and the combustion of fossil fuels. Human exposure to these gases is linked to a range of health-related issues.¹

Air quality has been a concern for cardiovascular health for decades. Particulate matter in the air plays a major role in causing various cardiovascular problems, including high blood pressure, vascular dysfunction, and clotting disorders.¹ Studies suggest that small airborne particles can seriously impact the cardiovascular system, affecting not only the heart but also the broader vasculature and overall bodily health.

Air pollution and cardiovascular health

Elements in air pollution cause a wide range of cardiovascular health problems, one of the most significant being coronary artery disease.² Exposure to air pollution initiates primary mechanisms such as systemic inflammation and oxidative stress. This then progresses to secondary mechanisms including platelet activation, the release of biological intermediates, autonomic dysfunction and more. These processes ultimately lead to a third level of impact, where critical organs are affected, resulting in endothelial damage, vascular dysfunction, thrombosis, hypertension, diabetes, and plaque rupture. Over time, this damage can lead to serious cardiovascular diseases such as myocardial infarction, arrhythmias, heart failure, and in some cases, even death.³ The risk of cardiovascular disease is influenced by both long-term and short-term exposure to air pollution.

long-term exposure, for example, can lead to coronary vasomotor abnormalities and carotid thickening, both of which increase the risk of heart failure. Several toxic and carcinogenic particles are involved in this process, including ozone, carbon monoxide, nitrogen dioxide, sulfur dioxide and lead. Arsenic exposure has been specifically linked to changes in single-nucleotide polymorphisms (SNPs), which contribute to cardiovascular damage.⁴

Other harmful components of air pollution include the particulate matter (PM), which can be transported into the vascular and respiratory systems. The most concerning particulate matter for cardiovascular health is PR 2.5 and PR10. Studies have shown that an increase in these particles correlates with a higher incidence of cardiovascular diseases.⁵ In addition, pollutants have been shown to alter the rhythm and contractility of the heart.¹

Preventions

While many environmental factors behind air pollution are beyond individual control, there are important personal actions that can help minimise exposure and reduce cardiovascular risk. Smoking is a major contributor to air pollution and cardiovascular disease, not only harming the smoker but also those exposed to second-hand smoke.² Preventative measures, such as avoiding smoking, wearing masks in high-pollution areas, maintaining a healthy diet, and supporting regular body function through physical activity, can significantly lower the risk of developing cardiovascular disorders.⁴

Summary

Although multiple studies have shown a strong connection between air pollution and cardiovascular health, several gaps in knowledge still remain. Specifically, more research is needed to determine the precise impact of both short-term and long-term exposure on heart health. Additionally, a deeper understanding of other particulate matters and their associations with cardiovascular conditions is required. Bridging these gaps will enhance knowledge in this field and enable earlier, more effective treatments for affected individuals, ultimately leading to better health outcomes.