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1 Small scooters are very much used in the congested centers of the European cities. Even if there is a continuous technical progress, the small two-wheelers are a remarkable source of air pollution. During the research programs of the Swiss Federal Office of Environment Forests and Landscape (FOEFL) - and as a contribution to the European project ARTEMIS *) analysis of limited and nonlimited emissions of scooters was performed. Exhaust emissions measurements of two Scooters: 4-stroke 125 cc and 2-stroke 50 cc have been performed with and without catalyst. Identical driving cycles have been repeated and the influence of the cooling duration on limited the emissions at cold start was investigated. A cold start in the temperature range of 20 - 25 °C can be regarded as a “summer cold start”. As nonlimited emissions the nanoparticulate emissions at cold and warm operating conditions were measured by means of SMPS, ELPI and NanoMet *).