Wood burning stoves are now the UK’s biggest source of toxic particles in air pollution and could be giving you cancer, according to a new report. A third of all PM2.5 emissions now come from log and coal-burning fires in homes. PM2.5 particles are too small to be filtered out and studies suggest they enter the bloodstream and have been linked to serious heart disease and lung cancer. One analysis of 17 studies found breathing in PM2.5 particles increases the risk of dying from lung cancer by 11 per cent. One US study found using a wood-burning stove indoors increase the chance of women developing lung cancer by 43 per cent. Another US study found people who use their wood burner for more than 30 days a year increase their lung cancer risk 68 per cent.