With the tightening of fire regulations, flame retardants have been added to all petroleum-based industrial and consumer goods. As a result, such chemicals have been found ubiquitous in the environment and humans. In recent years, the phase-out of some "legacy" flame retardants has prompted syntheses and large-scale production of a variety of new flame retardants, causing a new wave of environmental monitoring and research on these "emerging" chemicals. This book describes the advances in this field. The authors have compiled the mass spectra of all 209 congeners of polybrominated diphenyl ethers (PBDEs) and around 100 other halogenated and phosphate flame retardant chemicals.