Polycyclic aromatic hydrocarbons (PAHs) in exhaust emissions from diesel engines powered by rapeseed oil methylester and heated non-esterified rapeseed oil

► Emissions of PAHs from four diesel engines examined at different labs. ► Consistent results with different analytical methods and toxic equivalency factors. ► Biodiesel and rapeseed oil reduce lighter PAH, increase heavier carcinogenic PAHs. ► Biodiesel PAH reduction lower on particle filters without catalyst.