GOME ozone profiles retrieved within 3 hours after observations over one orbit on 23 March 2001. Global information on the chemical composition and related physical characteristics of the atmosphere and their trends, are required to improve the understanding of the behaviour of the atmosphere. The atmospheric ozone distribution shows strong fluctuations related to wind fields. New and consistent data sets describing the dynamics and the ozone distribution, like ozone profiles derived from GOME measurements in near real time, lead to a better description of the state of the atmosphere and can be used to improve numerical weather prediction. Image:KNMI/ESA.