How PM2.5 Particles Threaten Heart Health

Air pollution is one of the greatest environmental challenges of our time, with proven impacts on human health. While its link to respiratory diseases is widely recognised, fewer people are aware of how serious PM2.5 particles threaten the heart and cardiovascular system.

A 2023 study analysing four million hospitalisations for heart attacks found that cases increased as PM2.5 concentrations rose – even when those concentrations were below the legal limits set by the Environmental Protection Agency (EPA), USA.

What Are PM2.5 Particles?

PM2.5 particles are the global reference standard for measuring air quality. They include all particles smaller than 2.5 µm. To illustrate, 2.5 µm is about 3% of the diameter of a human hair.

The values used to express PM2.5 concentrations represent the total mass of all particles smaller than 2.5 µm in each volume of air.

How Do PM2.5 Particles Affect the Heart?

“I don’t think most people realize just how harmful air pollution is to our health, because it is mostly invisible.” says Mary Berlik Rice, Mark and Catherine Winkler Associate Professor of Environmental Respiratory Health, and director of the Center for Climate, Health, and the Global Environment.

PM2.5 particles are microscopic. The burning of fossil fuels, industrial production, wildfires, and more generates them. Due to their small size, they penetrate deep into the lungs, enter the bloodstream, and trigger inflammatory processes that increase the risk of:

• Heart attacks and strokes
• Arrhythmias and heart rhythm disorders
• High blood pressure
• Chronic inflammation of blood vessels

For all these reasons, it is clear that PM2.5 particles threaten heart health on multiple levels – from acute events to chronic diseases.

How Dangerous Is PM2.5 Exposure?

According to the World Health Organisation (WHO) webinar “Toxic air is fueling NCDs. Why are we not taking action?”, an increase of 10 µg/m³ in PM2.5 concentrations raises the risk of:

• Type 2 diabetes by 10%
• Heart attacks by 13%
• Strokes, cancer, and chronic obstructive pulmonary disease (COPD) by 16%
• Hypertension by 17%
• Childhood asthma by 34%
• Dementia by up to 46%

The most vulnerable individuals include those with pre-existing heart or lung diseases, diabetes, the elderly, economically disadvantaged communities, pregnant women, and children. These groups face invisible but long-term, serious health risks.

>> SEE ALSO: How Air Pollution Contributes to Cataract Formation
>> SEE ALSO: The Stunning Impact of Air Pollution on In Vitro Fertilization Success

Are PM2.5 Limits Adequate?

Regulatory standards play a crucial role in protecting public health, but the question remains: are they stringent enough?

According to the currently valid standards, these values vary:

• World Health Organisation (WHO) – recommends a maximum annual concentration of 5 µg/m³.
• USA – EPA reduced the critical average annual mass concentration of PM2.5 to 9 µg/m³ on February 7, 2024.
• EU – According to the EU Directive on Ambient Air Quality, effective October 2, 2024, the critical average annual mass concentration of PM2.5 is set at 10 µg/m³.
• Serbia – The limit remains at 25 µg/m³, almost three times higher than the new EPA limit, 2.5 times higher than the EU standard, and five times higher than the WHO recommendation.

>> SEE ALSO: EPA, USA Reduces Permissible Concentration of Harmful Particles in The Air with The New Standard
>> SEE ALSO: New EU Air Quality Regulations

What Is the Situation in Serbia?

Harvard studies show that even PM2.5 levels below 9 µg/m³ can increase the risk of heart disease.

With Serbia’s limit set at 25 µg/m³, the population remains exposed to significant health risks even when air quality is considered legally acceptable.

According to the Institute of Public Health of Serbia, “Dr Milan Jovanović Batut” cardiovascular diseases were the leading cause of death in 2023, responsible for 49.7% of all deaths, followed by cancers at 20.9%. These alarming figures underscore the urgent need to revise Serbia’s air quality regulations.

Are We Protected from PM2.5 Indoors?

Joseph Allen, a professor at Harvard University and director of the Healthy Buildings program, emphasises that we are most exposed to outdoor pollution when we are indoors.

And where do we spend most of our time?

Research from Harvard shows that we spend around 65% of our time inside our homes, where PM2.5 particles accumulate from outdoor air and indoor sources like cooking and cleaning products.

Since PM2.5 particles threatening heart health, are also present indoors, home protection becomes just as important as outdoor precautions.

Using proper ventilation with air purification can significantly reduce exposure and protect our health.

Marquis Intelligence provides turnkey ventilation systems with heat recovery (HRV) and integrated air purification, creating healthier living spaces without additional pollution.

The Need for Urgent Action

These facts clearly highlight the need to urgently reassess national air quality standards. PM2.5 is invisible but poses a real threat to heart health, making aligning regulations with global scientific knowledge a top priority.

It is time for clean air to stop being a privilege – and become a right for all.

For international partners planning projects in Serbia or the Western Balkans, cooperation with Marquis Intelligence provides a unique advantage: deep knowledge of local regulations, environmental challenges, and air quality standards that differ significantly from those in the EU and worldwide.

Our turnkey solutions ensure full compliance with national legislation while delivering the highest level of indoor air quality through advanced ventilation and air purification systems.

👉 Contact us to find out how we can support your projects with innovative solutions that meet both global expectations and the specific needs of the Serbian market.

Source: The dangers of air pollution for heart health

This article is part of the “Air Pollution and Health” series, in which Marquis Intelligence, as a socially responsible company, raises awareness about the harmful impact of polluted air on human health.
Document: MC-AP&H-006.25 – How PM2.5 Particles Threaten Heart Health.