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A light-duty diesel vehicle with an oxidising catalyst exhaust after-treatment device was fuelled with reference diesel and run in a transient driving cycle (new European Driving Cycle). The particulate emissions were sampled from the diluted exhausts using an Electrical Low Pressure Impactor (ELPI) with separation of the particles according to aerodynamic size into 13-size levels ranging from 30 nm to 10 μm. The particles were collected on glass fibre filters used as substrates in the impactor. The particlulate mass collected for each size level was determined by weighing the filter prior and after sampling. Each filter was extracted in dichloromethane (DCM) in an ultrasonic bath. The obtained raw-extracts were thereafter fractionated in accordance to increasing polarity into two fractions (I-II) using an open tubular silica column. The fractions were chemically characterised using Gas Chromatography-Mass Spectrometry.