This document specifies a measurement method for the determination of particulate benzo[a]pyrene (BaP) in ambient air, which can be used in the framework of the Council Directive 96/62/EC [1] and the Directive 2004/107/EC [2]. This document specifies performance characteristics and performance criteria to which the method should comply when it is used as a reference method. The performance characteristics of the measurement method are based on a sampling period of 24 h.This document describes a measurement method which comprises sampling of BaP as part of the PM10 particles, sample extraction and analysis by high performance liquid chromatography (HPLC) wit