Eminox Retrofit Solutions

Case Study: First Bus

Thursday October 24, 2019

Case Study: First Bus

 Driving Euro VI compliance with Eminox

First Bus is one of the UK’s largest bus operators, serving 1.6 million passengers across the country every day. The company is committed to positively impacting air quality in the town and city centres where it operates.

First Bus retrofitted by Eminox

First Bus retrofitted by Eminox

To prepare for the coming Clean Air Zones (CAZs) in England and Low Emission Zones (LEZs) in Scotland, the company has carried out an extensive vehicle upgrade programme, including retrofitting 166 vehicles to meet Euro VI regulations using Eminox’s SCRT® technology. Approved by the Clean Vehicle Retrofit Accreditation Scheme (CVRAS), Eminox’s solutions reduces NOx by up to 99% and particulate matter (PM) emissions by up to 95%.


“We needed to ensure Euro VI compliance while preserving our vehicle investment and extending the operational life of our fleet,”

“Given the size and geographic spread of our operations, it was vital for us to retrofit vehicles successfully within tight time frames, avoiding any impact on passengers, whilst improving air quality.’ Eminox’s combination of experience, engineering expertise and partnership approach mean this significant project was delivered on time, helping us to efficiently manage our fleet upgrade programme.”

Michael Campbell, First Group’s Engineering Projects Manager.


First Bus and Eminox have worked together for many years. The latest retrofit project saw a mixture of Euro IV and V, Volvo B9TL and ADL Enviro 300 vehicles upgraded, with work carried out at multiple customer sites.

As part of the programme, telemetry was fitted to all vehicles. This integrates with on-board diagnostics to manage the exhaust aftertreatment system, optimising and monitoring its performance. This provides First Bus with real-world, real-time data and enables proactive maintenance.

By working with Eminox, First Bus is now well prepared to play a part in improving air quality in town and cities across the UK, whilst prolonging the life of its fleet.

Contact our Retrofit team

Contact us