Exposure characteristic and PM measurements
Combustion conditions were monitored by measuring OMeasurements of twelve different particulate bound pure PAHs in the chamber was performed during ten exposures through sampling with polytetrafluoroethylene (PTFE) coated glass fibre filters (Ø 47 mm). The filters were extracted using pressurized liquid extraction and purified on columns with KOH-impregnated silica gel eluted with dichloromethane, after which the eluate was evaporated, and the solvent exchanged to toluene. The samples were then analysed with gas chromatography (GC) high-resolution mass spectrometry (HRMS) operated in electron ionization mode. To identify target compounds, GC retention data for the samples were compared with reference standards. A lab blank was run, and the number of individual compounds in the blank was below 10% of the amount found in corresponding samples, thus no blank corrections were performed. Twelve different PAH compounds were quantified, and the total PAH concentration in the chamber was 6.46 ± 2.72 μg/m