Conversely, burning wood or dung can create polycyclic aromatic hydrocarbons; dangerous compounds that have been linked to several types of cancer, as well as long-term DNA damage.

相反地，燃烧木头或粪肥会产生多环芳香烃；它们是危险的化合物，和多种癌症和长期的 DNA 损伤有关。