Maximum Concentrations at the Workplace. Significance, use and derivation of MAK values -- List of Substances -- Carcinogenic Substances -- Sensitizing substances -- Aerosols -- Limitation of exposure peaks -- Percutaneous absorption -- MAK values and pregnancy -- Germ cell mutagens -- Substances requiring special consideration -- Assessment Values in Biological Material. Significance and use of BAT values and BLW -- List of substances -- Carcinogenic substances -- BLW -- BAR -- CAS Number Index -- Members of the Commission and Permanent Guest Contributors -- Constitution and Procedures of the Permanent Commission for the Investigation of Health Hazards of Chemical Compounds in the Work Area -- Substances in the lists of MAK values1) and BAT values2) reviewed in 2018/2019 -- Substances being Examined for the Establishment of MAK Values and BAT Values -- Procedure of the Commission for the Investigation of Health Hazards of Chemical Compounds in the Work Area for making Changes in or Additions to the List of MAK and BAT Values -- List of MAK and BAT Values 2019.