atmosphere Article Regulated and Non-Regulated Emissions from Euro 6 Diesel, Gasoline and CNG Vehicles under Real-World Driving Conditions Ricardo Suarez-Bertoa 1,* , Martin Pechout 2, Michal Vojtíšek 3,4 and Covadonga Astorga 1 1 European Commission Joint Research Centre, 21027 Ispra, Italy;
[email protected] 2 Department of Vehicles and Ground Transport, Faculty of Engineering, Czech University of Life Sciences, Kamycka 127, 16521 Praha, Czech Republic;
[email protected] 3 Department of Vehicles and Engines, Technical University of Liberec, 46117 Liberec, Czech Republic;
[email protected] 4 Department of Automotive, Combustion Engine and Railway Engineering, Faculty of Mechanical Engineering, Czech Technical University of Prague, Technicka 4, 16000 Prague, Czech Republic;
[email protected] * Correspondence:
[email protected]; Tel.: +39-0332-78-3756 Received: 19 January 2020; Accepted: 11 February 2020; Published: 14 February 2020 Abstract: The transport sector is one of the main sources air pollutants. Different exhaust after-treatment systems have been implemented over the years to control the emissions of criteria pollutants. However, while reducing the emissions of the target compounds these systems can lead to the emissions of other pollutants and/or greenhouse gases such as NH3 or N2O. Following the implementation of the Real Driving Emissions (RDE) test procedure in the EU, vehicles have been equipped with more complex after-treatment configurations. The impact that these technologies may have on the emissions of non-regulated pollutants during real-world driving have not been evaluated until now. In the current study we present the on-road emissions of a series of non-regulated pollutants, including NH3,N2O, CH4 and HCHO, measured with a portable FTIR from a series of Euro 6d, Euro 6c and Euro 6d-TEMP, gasoline diesel and compressed natural gas (CNG) vehicles during real-world testing.