Many workers concerned with the problems of community air pollution have recognized the need of assembling in one reference the scattered information relating to past air pollution surveys that exist in the literature of libraries and in files of control agencies, health department, universities and research institutions. The Register of Air Pollution Analyses has been prepared as a step toward filling this need. Contained within the Register is a record of community air sampling and analyses performed in the United States and the Territories of Alaska and Hawaii prior to January 1, 1956. More than 100 different chemically definable individual pollutants or constituents of mixed ones, such as dustfall, are listed for 200 cities in 110 counties of 32 states and territories.