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Acknowledgements We wish to thank the Engineering and Physical Sciences Research Council (EPSRC) who have funded the HyFCap (Reducing the cost and prolonging the durability of hydrogen fuel cell systems by in-situ hydrogen purification and technology hybridisation) (grant number: EP/ K021192/1) jointly carried out by University College London and University of Sheffield. Author details Julius Partridge, Wei Wu* and Richard Bucknall *Address all correspondence to: w.wu.11@ucl.ac.uk University College London, London, UK References [1] Weston M, Emissions from the TfL bus fleet safety, accessibility and sustainability panel, Transport for London, 2015, pp. 11 http://content.tfl.gov.uk/sasp-20150707-part- 1-item07-reducing-emmisisons-from-the-bus-fleet.pdf [2] IEA. Energy and Air Pollution World Energy Outlook, Special Report. 2016, pp. 13-16 [3] Yamada H, Hayashi R,Tonokura K. Simultaneous measurements of on-road/in-vehicle nanoparticles and NOx while driving: Actual situations, passenger exposure and sec- ondary formations. Science of Total Environment. 2015;563-564:944-955 [4] Degraeuwe B, Thunis P, Clappier A, Weiss M, Lefebvre W, Janssen S, Vranckx S. Impact of passenger car NOx emissions and NO2 fractions on urban NO2 pollution—Scenario analysis for the city of Antwerp, Belgium. Atmospheric Environnment. 2016;26(2):218-224 [5] Cooper E, Arioli M, Carrigan A, Jain U. Exhaust emissions of transit buses: Sustainable urban transportation fuels and vehicles. 2012;40(4):1-40 [6] TfL, Improving the health of Londoners, Transport action plan, greater London Authority, 2014, pp.32 http://content.tfl.gov.uk/improving-the-health-of-londoners-transport-action- plan.pdf [7] TfL. Transport emissions roadmap. Transport London, 2014;1:1-48 [8] White P, Impacts of bus priorities and busways on energy efficiency and emissions, University of Westminster, 2015, pp.12 http://www.greenerjourneys.com/wp-content/ uploads/2015/09/Binder2.pdf [9] Robb A, The new bus for London - diesel/electric hybrid, Clean fleets case study, Clean fleets, 2014. pp. 1-5 http://www.clean-fleets.eu/fileadmin/New_Bus_for_London_Case_ Study_for_Clean_Fleets_-_final.pdf Development of Bus Drive Technology towards Zero Emissions: A Review http://dx.doi.org/10.5772/68139 53