Last update: 04/11/2003 15:42:19
The main objective of this project is to assess the levels of NO2 actually emitted by modern engines; and to compare and reconcile the emissions with quantities from roadside sampling methods (the latter will be influenced by conversion and formation of ozone).
This was a joint project with the Highways Agency. The project has provided information on how much NO2 is actually emitted by vehicles rather than formed by the reaction of nitric oxide with ozone in the atmosphere. The objectives of the study were to:
- establish the quantity of NO2;
- determine what discrepancies exist between NO2 emitted and that measured using standard sampling measures;
- determine the sensitivity of NO2 to cold starts and transient driving cycles;
- estimate the contribution of primary NO2 emitted from vehicles to measured at road side locations.
The results were disseminated through a report (on the Department and TRL websites).
The DTI became interested in the work and requested extra testing (to be carried out at their expense).
Crowthorne House, Nine Mile Ride, Wokingham, Berkshire, RG40 3GA
+44 (0)1344 773131
Cost to the Department: £119,148.00
Actual start date: 28 June 1999
Actual completion date: 01 June 2002
Assessment of primary NO2 emissions, hydrocarbon speciation and particulate sizing on a range of road vehicles
Author: S Latham, S Kollamthodi, P G Boulter, P M Nelson and A J Hickman
Source: TRL (not published) - available on the TRAMAQ web pages at DfT