LONG RANGE TRANSPORT OF PEROXYACETYLNITRATE TO SCANDINAVIA

Model studies and measurements of PAN have been used to analyse the possibility of long-range transport of PAN to Scandinavia. During time periods when air masses accumulate hydrocarbon and nitrogen oxides pollution from sources in Europe and then move towards Scandinavia without any synoptic scale break up of the atmospheric boundary layer, PAN concentrations in the range 1-5 ppb in Scandinavia may to a large extent be caused by long-range transport.