Regulated and unregulated exhaust emissions from two three-way catalyst equipped gasoline fuelled vehicles

This investigation presents emission factors of both regulated (CO, HC, NOx and particulate) and unregulated pollutants (aldehydes, monocyclic aromatic compounds and polycyclic aromatic compounds) measured under three different driving conditions, i.e. cold transient, stabilised and hot transient. These three driving conditions were simulated using the US FTP-75 driving cycle. Two three-way catalyst equipped light duty passenger cars were investigated. As expected, a higher emission of both regulated and unregulated pollutants was observed in the cold start phase of the driving cycle.