Division 2.1.4

United Kingdom

In Section 6 of Annex 9 of UN/ECE Regulation No 83, the sixth subparagraph shall be understood as follows:

A multiplicative exhaust emission deterioration factor shall be calculated for each pollutant as follows:

D.E.F. = \frac{{Mi}_{2}}{{Mi}_{1}}

At the request of a manufacturer, an additive exhaust emission deterioration factor shall be calculated for each pollutant as follows:

D.E.F. = {Mi}_{2} - {Mi}_{1}