On the 20^th of November 2012 the first meeting took place of Working Group 2, tasked by CEN/TC274 “Air Quality” to revise EN 13725:2003 ‘Air Quality - Determination of odour concentration by dynamic olfactometry’.

   After 8 years of work and 17 meetings, the final draft of the revised standard is finally completed and submitted on May 31^st 2021 for formal vote in the CEN Technical Committee 264 “Air Quality” in 2021. This paper lists the changes that will affect the practice of olfactometry in Europe, once this standard is published as EN 13725:2021.

   The aim of this paper is the definition of a new theoretical method for the evaluation of occupational exposure risk for workers involved in dynamic olfactometry. These workers, also called panellists, can be exposed to hazardous pollutants potentially present in odourous mixtures.

   Despite the relevance of this topic, in the regulation and the scientific literature, a standardized method to evaluate the panellists’ occupational is not provided. Therefore, this work aims to suggest practical solutions for the risk assessment of olfactometric workers. The proposed approach is based on the quantification of non-carcinogenic and carcinogenic risk for panellists’, based on the evaluation of hazard indexes (HIs) and the inhalation risks (IRs) for the odorous mixtures.