This handbook is an edited version of the final report of the European Commission and IEA Bioenergy sponsored Pyrolysis Network that officially finished in 2004. It provides a companion volume to the first (ISBN 978-1-872691-07-7) and second (ISBN 978-1-872691-47-3) handbooks published in 1999 and 2002 respectively also available from CPL Press (www.cplpress.com). It is again intended that this will provide a useful guide both to newcomers to the subject area as well as those already involved in research, development and implementation. A significant feature of this third volume is the greater attention paid to wider issues concerning pyrolysis including environment, health and safety, norms and standards and marketability.