The basic principle and the fundamentals of emissions calculation according to COPERT (COmputer Program to calculate Emissions from Road Transport) are explained here.
The emissions calculation according to COPERT can be calculated using the COPERT database (COPERT vehicle strata with the associated emission factors and COPERT fleet compositions) on the one hand and user-defined inputs, i.e. vehicle strata of type 'custom', their emission factors, and user-defined COPERT fleet compositions, on the other. The basic principle and procedure are similar in both cases. In the second case, the results depend on the scope of the input data, in particular the emission factors.
