# Motor Vehicles (Construction and Use) Regulations (Northern Ireland) 1999, Paragraph 7


In this Part of this Schedule—
(a) a reference to the lambda value, in relation to a vehicle at any particular time, is a reference to the ratio by mass of air to petrol vapour in the mixture entering the combustion chambers divided by 14.7; and
(b) “the emissions publication” is the publication entitled “In-Service Exhaust Emissions Standards for Road Vehicles (Third Edition)” (ISBN 0-9526457-2-6) published by the Department of Environment, Transport and the Regions.

---
Source: https://www.legislation.gov.uk/nisr/1999/454/schedule/10/paragraph/7 (the official version)
Page: https://openlegislation.uk/motor-vehicles-construction-and-use-regulations-northern-ireland-1999/schedule-10/paragraph-7
Contains public sector information licensed under the Open Government Licence v3.0. Source: legislation.gov.uk, The National Archives.