The central focus throughout this work is the successful progression and environmental advancement to establish clean air in metropolitan centres where, per force, transport systems converge. With that convergence air pollution increases.

Given that as a fact, the concentration of evidence and acceptability takes the 2013 European urban transport report as a focal point to work from. The focus of that report is the replacement of diesel engine powered Passenger Carrying Vehicles (PCVs), previously known as Public Service Vehicles (PSVs), with an alternative non air polluting means of propulsion for PCVs.

The time taken to install a project, the cost of that project and the benefit derived from the installation are of paramount importance. This publication brings projects into 2022 costings and opens the contrary public transport world up to intimate scrutiny.

If you are a clean air enthusiast then this analysis of the last 25 yours brought into 2024 perspective is a MUST READ.