Summary Ge(Li)-detector measurements of radioactive nuclides in ground level air up to mid-year 1975 at three Swedish sampling stations, Ljungbyhed, Grindsjön and Kiruna, are reported. Ljungbyhed values are given from April 1974, Grindsjön values from August 1972 and Kiruna values from August 1973. The main source of particulate radioactivity during the period of interest was the Chinese nuclear explosions of March 1972, June 1973 and June 1974. Specific discussions are given for the 7Be-, 54Mn-, 88Y-, 95Zr-, 103Ru-, 106Ru-, 125Sb-, 131I-, 137Cs-, 140Ba-, 14lCe-, l44Ce- and 155Eu-activities.