How to calculate an Ecoscore when some data are missing?

We need quite a lot of data if we want to calculate an Ecoscore (see info page on data collection). For older vehicles, air pollutant emissions (CO, HC, NOx and PM), noise and/or CO2 emissions are often missing. The method described below only applies to cars and vans.

When emission data for air pollutants are lacking, we complete these gaps by using the values from the table below (expressed in g/km; these values only apply to cars). Starting from Euro 1, they perfectly correspond with the Euro emission standards (see European measures). Beware, we maken an exception for NOx in the case of diesel cars. More info: http://www.ecoscore.be/en/info/ecoscore/nox.

The first date applies to new vehicle models, the second date applies to all new vehicles. 

If the noise emissions are missing, we assume a default value of 74 dB (A) for all vehicles with a conventional internal combustion engine or normal hybrid (no plug-in) drive. We assume that plug-in hybrids and fully electric vehicles are generally quieter, and therefore we assume a default value of 68 dB (A) for these types of vehicles.

When emissions of CO2 are lacking, we use default values from the table below (expressed in g/km). This table was arranged based on average emissions of a representative set of vehicles.