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  • Adam Bardsley

Plymouth Citybus | Plymouth City Council

Updated: Jan 24, 2022

Reproduced with kind permission of AECOM.

Plymouth Citybus and Plymouth City Council are trialling technology known as an EXO

cell developed by Atmos-Clear Limited ( on 5 vehicles each, with the aim of reducing the production of toxic emissions from engines.

Installing at Plymouth Citybus depot on the 1st of 5 vehicles.

Case Study Description

  • The system works by adding hydrolysed gas to the regular fuel/air mixture. The result is a faster, cooler fuel burn which eliminates almost all waste gases produced and provides overall better fuel economy

  • Different cell sizes can be used for various vehicles, all the way from car derived vehicles and those with small engines to larger commercial vehicles with larger engines

  • Trials have previously taken place in locations such as Paris and are now taking place in Plymouth

How this has helped the South West of England

  • This trial shows how Plymouth is at the forefront of the development of these new technologies to help Plymouth and the wider region to develop a route to net-zero

  • Technologies that can help reduce emissions of diesel and petrol vehicles can offer a quicker solution in comparison to alternatively fuelled vehicles which may be more expensive and take longer to come through

  • This also offers a versatile solution that can help a number of vehicle types with different engine sizes, offering a possible solution to a wide variety of vehicles within the freight sector

Note: This case study has been developed as part of the South West Freight Strategy for Peninsula Transport and Western Gateway Sub-National Transport Bodies by AECOM and WSP transport consultancies.

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