Wood burning stoves have grown in popularity and experts say that, in the UK, domestic wood burning is one of the largest single sources of a type of air pollution known as PM2.5, tiny particles that penetrate deep into the lungs. Dr Horsfall told the Congress: “We know wood burning at home emits harmful air pollution both indoors and outdoors including known carcinogens. “Although new eco-design European wood-burners are generally considered cleaner and safer than more traditional wood stoves, many European homes still employ older wood burners, and even the newer stoves may not be entirely risk-free. This study underscores the need for clearer public health guidance and regulation around domestic wood burning. “People should be aware that these stoves could be harming them and their families, and doctors should be asking their patients about whether they are using stoves at home.”