A clean-burning stove is a stove with reduced toxic emissions. The term commonly refers to wood-burning stoves for domestic heating, although it is also applied to cooking stoves. It is distinct from a clean-burning-fuel stove, which typically burns clean fuels such as ethanol, biogas, LPG, or kerosene. Studies into clean-burning stoves have shown that they reduce the emissions of dangerous particulates and carbon monoxide significantly, use less fuel than regular stoves, and result in fewer burn injuries. However, the emissions they produce are still much greater than the safe limits, and they do not appear to be effective at reducing illnesses such as pneumonia induced by breathing polluted air, which may have many sources.