The acronym RDE stands for Real Driving Emissions and refers to the tail-pipe emissions performance of your vehicle during a typical “real world” drive.
RDE was introduced as a legal requirement in 2016 under the European Commission legislation RDE (EU) 427/2016. The legislated pollutants are Nitrogen Oxides (NOx) and Particulates (Particulate Number - PN). Carbon Dioxide (CO2) and Carbon Monoxide (CO) are also monitored over the drive.
RDE emissions are measured by using a Portable Emissions Measurement System (PEMS) which is fitted to the vehicle to record in real-time, pollutants produced by the vehicle during a typical daily drive.
An RDE test consists of driving a vehicle on public roads equipped with the PEMS kit and meeting a range of criteria defined by the legislation. These include: road type (equal share between rural, urban and motorway), distance covered, average speed, ambient temperature, altitude and the driver characteristics.