Page 21 - Eden Meadow 35 houses application as of 12 October

LAND TO THE REAR OF EDEN MEADOWS, NEWINGTON

AIR QUALITY ASSESSMENT

ADMS-Roads

4.10 Modelling the impact of traffic emissions on the proposed development will be undertaken
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using the latest version of the ADMS-Roads model . ADMS-Roads is significantly more
advanced than that of most other air dispersion models in that it incorporates the latest
understanding of the boundary layer structure, and goes beyond the simplistic Pasquill-Gifford
stability categories method with explicit calculation of important parameters. The model uses
advanced algorithms for the height-dependence of wind speed, turbulence and stability to
produce improved predictions.

Emission Factors

4.11 Defra and the devolved administrations have provided an updated Emission Factors Toolkit
(Version 9.0) which incorporates updated NOx emissions factors and vehicle fleet
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information . These emission factors have been integrated into the latest ADMS-Roads
modelling software. However, in order to undertake a worst-case assessment emission
factors for 2019 have been used for all modelled years.

Traffic Data

4.12 Modelled vehicle flows have been provided by DHA Planning Ltd and is summarised in Table
3. Traffic data for the A2 High Street in Rainham has been modelled to determine the impact
of the proposed development through the Rainham AQMA.

4.13 For the modelled speeds, the figures provided above have been used. However, where a link
approaches a junction a speed of 20 kph has been modelled in order to represent queuing
traffic at a junction.

8 Model Version: 5.0.0.1. Interface Version 5.0.0.5313 (16/03/2020)
9 https://laqm.defra.gov.uk/documents/EFT2019_v9.0.xlsb
Lustre Consulting Ltd
Report Ref.: 3143/MD/07/2020 Page No. 19