Ozone depletion occurred in the core of the plume of smoke from the Kuwait oil fires within 100 km of the fires, primarily in regions where NOx concentrations were high and ultraviolet flux was near zero. Rapid conversion of NO and NO2 can explain almost all of the ozone loss. Ozone was produced in diffuse regions of the plume, where the ultraviolet flux was higher than in the core. However, due to the relatively high ratio of nonmethane hydrocarbons to NOx, ozone production was slow. Since ozone was produced in a much larger volume that it was depleted, the plume as a whole was a source of ozone on a regional scale. ¿ American Geophysical Union 1992