Ozone data were obtained from 8 km to the surface and at latitudes from 38¿ to 76¿ N during January and February 1983. Flight lines covered northeastern U.S., Canada, and Greenland. The results of the latitudinal survey at 5- to 8-km altitude showed 03 mixing ratios to be ‴40 ppby with little variation in latitude. One region of elevated 03 was observed and extended from 54¿ N to 57¿ N latitude. Ozone reached 1540 ppbv at 6.4-km altitude. This sampling was stratospheric air as the tropopause height was 5.6-km altitude. Profiles at 76¿, 67¿, and 53¿ N showed 03 to be well mixed from about 5 km to the surface. In some cases, profiles identified a layer of 1 km to 100 m vertical dimension at the surface, in which 03 destruction had occurred.