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Emission Factors 2003 final report - executive summary

The National Atmospheric Emissions Inventory (NAEI) provides emissions inventory data for the UK. The Department for Transport (DFT) conducts emission testing on the latest vehicles and supplies this data to the NAEI to maintain the accuracy of this inventory.

The DFT commissioned Shell Global Solutions to conduct emissions tests on a range of vehicles. This report includes the results from all modules of the commissioned test work.

Module 1 9 Euro 2 Light Goods Vehicles (LGVs)
  11 Euro 3 LGVs
Module 2 11 Euro II Heavy Goods Vehicles (HGVs)
  11 Euro III HGVs
Module 3 3 Euro II Buses
  3 Euro III Buses
  2 Euro II Coaches
  2 Euro III Coaches
Module 4 4 Alternatively Fuelled/New Technology Vehicles (2 LPG, 1 diesel vehicle with a particulate trap and 1 hybrid)
Module 5 1 Euro 3 London Taxi Cab, Diesel

The driving cycles used for Modules 1, 4 and 5 were the NEDC, 6 Warren Springs Laboratory road-driving and 2 Artemis drive cycles. The FIGE transient cycle and the ESC test were used in Module 2, the FIGE transient, the ESC, the Cold FIGE(2) city bus cycle and the Millbrook London Transport Bus cycle were used in Module 3.

Particle size and number measurements, using an Electrical Low Pressure Impactor (ELPI) measurement devise, were taken for all tests.

The measurement of various unregulated emissions were included depending on the test module requirements, a filter and sample cartridge for the measurement of Polycyclic Aromatic Hydrocarbons (PAH), an FTIR exhaust gas analyser measured various organic compounds, including ammonia (NH3), nitrous oxide (N2O) and 1-3 Butadiene. The ratio of NO:NO2 was measured using a nitric oxide (NO) and a nitrogen dioxide (NO2) analyser in the raw exhaust.

The PAH filters and sample cartridges were analysed for 18 PAH’s, 16 PAHs, considered to be the most important for air quality by the US EPA, and a further 2 considered being important by the DFT.

The emission results obtained from the testing have been used where possible to generate speed dependant emission curves.