New research from the University of Manchester and the University of York tested an Ecodesign-compliant wood stove under five loading conditions. Hot reloading, overloading, underloading, and open-door burns all pushed combustion toward an oxygen-poor phase, raising emissions of ultrafine particles, black carbon, and polycyclic aromatic hydrocarbons. The study also measured how soot particles are mixed with organic coatings, which affects climate warming and toxicity. Certification tests often assume ideal operation, but real users do not follow the manual. The authors say loading the stove per the manufacturer guidance, using appropriately sized dry wood, and avoiding reloading a blazing hot firebox can keep combustion in a cleaner mode. The findings matter for households, air quality regulators, and any biomass policy that assumes modern stoves are clean in practice.
