Increasingly stringent legislation aims to reduce exhaust gas particulate levels - and not only for vehicle with Diesel engines. Various authorities have set limits for the mass of particulate (PM) emitted over a legislative driving cycle and the EU has added particle number (PN) limits. Additionally, there is considerable interest in particulate emissions from engine types traditionally assumed to have zero particulate emissions - port fuel injected vehicles running on gasoline, LPG and CNG. Regional specifics such as drive cycles mean that the legislative particulate emissions result varies from jurisdiction to jurisdiction, even where the same vehicle is used for testing. This study tested multiple vehicle types over several driving cycles, using a mixture of legislative and non-legislative measurement devices to characterise the particulate emissions and examine the impact of both the vehicle's characterisitcs (engine/fuel type, displacement, inertia) and the test conditions on particulate emissions.