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Updated CURED to V2A

17-08-2016

Air Quality Consultants Ltd has updated its Calculator Using Realistic Emissions for Diesels (CURED) spreadsheet to Version 2A

Defra has released an updated version of its Emissions Factors Toolkit (EFT) (V7.0), which replaces EFT V6.02.  The new EFT takes account of updated emissions functions and updated information on fleet compositions; particularly within the Ultra-Low Emission Zone (ULEZ) in the centre of London.  CURED, which has been developed to address uncertainties in real-world emissions from diesel vehicles, has been updated to V2A to be consistent with EFT V7.0. 

CURED V2A uses the same information on vehicle fleet compositions as EFT V7.0.  It also uses same shaped speed-emissions curves as EFT V7.0; albeit that these have been uplifted to give higher predicted emissions of nitrogen oxides (NOx).  The rationale for the uplifts applied in both versions of CURED is given in the review of in-service emissions from diesel vehicles prepared by Air Quality Consultants (review available here). 

As well as updating CURED, Air Quality Consultants has updated its note explaining how future-year background concentrations can be predicted for use with CURED V2A (August 2016 note available here).  This includes fresh calibration factors derived by comparing Defra’s latest background maps against suitable background measurements.

Finally, Air Quality Consultants has provided a high-level comparison of how  predictions made using EFT V6.02, EFT V7.0, CURED V1A, and CURED V2A differ from each other (high-level comparison available here).  This shows that future-year NOx emissions predicted using EFT V7.0 will be much lower than those predicted using Defra’s earlier EFT.  In contrast, future-year NOx emissions predicted using CURED V2A will, for most vehicle speeds and locations, not be appreciably different from those predicted using CURED V1A. There will, however, be some marked differences at certain speeds and within the London ULEZ.

 



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