What role does ULSD play in improving air quality?
For existing vehicles ULSD will bring some reductions in sulphur dioxide and particle emissions over standard diesel with no modifications required to engines. However, the most effective way of improving air quality is to keep vehicles properly maintained and to replace older vehicles with new vehicles with improved engine technology. The use of ULSD can help to optimise the potential benefits of new engine technologies and exhaust after treatment devices such as catalysts and particulate traps, with consequent benefits to fuel efficiency and carbon dioxide reduction.
