Preface The information contained in this pamphlet on sulfur regulations was compiled with the assistance of industry representatives and state petroleum organization personnel. It is hoped the reader will find the sulfur limitations for proposed as well as the current regulations on the various fuels a useful reference. All readers are requested to advise the API Department-of Environmental Affairs Staff of the availability of any new or revised data. The validity of the data contained in this pamphlet and the usefulness will depend upon the cooperation received from the readers.