Atmospheric PCDD/F burden was determined by monitoring human hair. Unwashed hair shows significant higher concentrations of PCDD/F than washed hair samples. Washing reduces the accumulated concentration by a factor of two for the octachlorinated congeners up to 100 fold for the hexachlorinated congeners. The related theory to these results is outlined and in good agreement with the presented measurements. This method promises to be a new simple one for PCDD/F exposure estimation to ambient air.