Project: TRAMAQ-Cold Start Emissions

Reference: UG219

Last update: 09/09/2003 15:00:14


The objective of this project is to report on the emissions during cooling down and warming up periods of cars. We intend to compare predictive models against actual test measurements.


For passenger cars, cold starts often represent a significant proportion of the total emissions per trip and therefore a possible major contributor to pollution caused by traffic. More information is necessary for local authorities to be able to assess the influence this might have on air quality. Information is required to assess the emissions produced over a full range of temperatures, and the frequency and duration of additional emissions produced by cold engines. The project has carried out a literature review to establish current knowledge on the subject. It is determining temperature profiles of sample vehicles, and the excess cold start emissions for these vehicles. From this information, it is providing a predictive model and assessing this in a pilot study of parking schemes. The results will be disseminated through reports, technical papers and Traffic Advisory leaflets. The results will also be used in other related research projects such as UG218.


AEA Technology Environment
Harwell Business Centre, Didcot, Oxfordshire, OX11 0QJ
+44 (0)1235 432201

Contract details

Cost to the Department: £184,000.00

Actual start date: 29 January 1999

Actual completion date: 07 August 2001


Inception Report UG219 TRAMAQ Cold Start Emissions-
Author: D C W Blaikley, R Jones, A P Smith and E A Feest at AEA Technology
Source: Available from AEA Technology, or contact

Literature and Data Review, UG219 TRAMAQ Cold Start Emissions
Author: J O Norris, D C W Blaikley and A P Smith of AEA Technology.
Source: Available from AEA Technology, or contact

Departmental Assessment Status: Project completed prior to the implementation of the Departmental publications scheme.