The activities of 32P and 33P induced in Cl, S, and K targets during exposure to cosmic rays were measured at Mt. Washington (55.7 ¿N, 1917 m) allowing the in situ production rates of the nuclides to be determined in all the major ocean targets. Furthermore, the production rates of 32P and 33P in Cl, the major ocean target, were determined at three different altitudes in the atmosphere at Woods Hole (53 ¿N, 10 m), Mt. Washington and l'Aiguille du Midi (47.4 ¿N, 3820 m). The exponential attenuation length of the production rates of 32P was found to be consistent with the attenuation length of neutrons in the lower atmosphere at mid-latitudes. The data allow the in situ oceanic production rates of the nuclides to be estimated at all latitudes. ¿ American Geophysical Union 1994