Excalibre are the UK partner for Proventia Oy. Excalibre are a leading supplier of retrofit SCR+DPF systems for TfL and work with all the major operators. With over 1,000 systems installed in London the same technology is now being introduced to Clean Air Zones across the UK.

The Proventia NOx BUSTER® City is a retrofit system which enables Euro 3,4 or 5 buses and trucks to meet Euro 6 standards. Click here to read more about the benefits of our Proventia partnership.