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An operational air pollution forecast model system, THOR, has been developed. The system is used for 3-days forecasting, monitoring and traffic and/or emission reduction scenarios. The model system includes several models capable of calculating air pollution concentrations at different spatial scales, ranging from European scale over urban background scale down to urban street scale. When coupling models covering such different scales, it is possible to include contributions both from local, near-local and non-local emission sources in order to describe the air quality at a specific location––e.g. in a street canyon. The different air pollution models are driven by a numerical weather forecast model. Operational three days air pollution forecasts are produced four times every day. The system can, in principle, be applied for any city in Europe. Currently the regional model has been implemented for the whole of …