In addition to his work in the field of education, Landsberg was active in public service. During World War II, he headed a project for the United States Air Force that provided information on climate and weather statistics in areas undergoing military missions. The U.S. Air Force Chief of Staff officially commended him for this service. Landsberg became the acting director of the Joint Research and Development Board's Committee on Geophysical Sciences (1946) and then the director (1949). In 1949, Landsberg was appointed to the Air Pollution Committee of U.S. President Harry S. Truman, where he helped to shape U.S. air pollution regulations.