New research has revealed a hidden pollution risk from smokeless or low-smoke fuels used for home heating. Scientists found that these fuels release large quantities of ultrafine particles that can travel deep into the human lungs.

These fuels are widely marketed as cleaner alternatives to coal, wood, and peat. However, laboratory tests showed that the smoke from these fuels contains extremely tiny particles that remain suspended in the air.

Because these particles are smaller than the wavelength of light, they can penetrate deeply into the respiratory system. As a result, they may create significant health risks.

Researchers said they did not expect such strong ultrafine particle emissions until the test results appeared.

Consequently, the findings raise new concerns about domestic heating pollution.

🧪 Tests Show Higher Ultrafine Particle Emissions

Researchers discovered the issue while testing fuels in both traditional stoves and modern eco-design stoves. They compared smokeless fuels with common fuels such as wood and coal.

The results showed that low-smoke fuels produced two to three times more ultrafine particles for each kilogram burned.

These fuels included low-smoke coal ovoids and biomass briquettes made from olive stones. Scientists initially expected lower pollution levels because the fuels produce less visible smoke.

However, the data revealed the opposite trend. While the fuels reduced overall smoke mass, they released far greater numbers of microscopic particles.

Therefore, the findings challenge the assumption that smokeless fuels automatically improve air quality.

🌆 Outdoor Measurements Confirm Winter Pollution

Scientists also analysed outdoor air data collected in Dublin and the Irish town of Birr. They focused on winter evenings, when many households use fireplaces and stoves.

The measurements showed high concentrations of ultrafine particles during these periods. In some cases, levels exceeded those recorded in major polluted cities such as Beijing and Shanghai.

Researchers noticed that particle levels increased after households began switching to low-smoke fuels. This pattern closely matched the laboratory findings.

Consequently, scientists concluded that domestic heating with smokeless fuels likely contributes to local air pollution.

⚠️ Health Risks Linked to Tiny Airborne Particles

Ultrafine particles pose a serious health concern because their tiny size allows them to lodge deep inside lung tissue. These particles can also carry poly-aromatic hydrocarbons, some of which scientists classify as carcinogens.

Researchers therefore warn that replacing smoky fuels with low-smoke alternatives may not fully solve air pollution problems.

Earlier restrictions on smoky coal significantly improved air quality and reduced respiratory deaths. However, the new study suggests that simply replacing one solid fuel with another may still carry health risks.

Therefore, scientists recommend a broader approach to tackling pollution from domestic heating systems.