The main difference between pyrolysis and combustion (incineration) is the presence of oxygen. Whilst the combustion process runs with the active intake of atmosphere air, the pyrolysis runs in the absence of oxygen, in an inert gas environment. This prevents the burning of the material but induces chemical decomposition resulted in the production of synthetic gas. Another difference is the temperature. Usual temperatures for pyrolysis (450-600 °C) are lower than temperates in the incinerator (~800 °C).