Emissions

A suite of tools are available to help local authorities assess their local emissions including industrial emissions nomograms, emissions estimates on a km by km basis, and road vehicles emissions.

Biomass Calculator

Download the Biomass Calculator (XLS 22 KB) - a MS Excel spreadsheet which reproduces the graphs published in LAQM.TG(09).

Emission Factors Toolkit for Vehicle Emissions

February 2012: Click here for an update on road traffic emissions factors.

Defra and the Devolved Administrations have provided an updated Emission Factors Toolkit (Version 4) based on new (released in 2009) vehicle emissions factors. The toolkit allows the user to calculate vehicle emissions for multiple road links based on vehicle fleet composition, traffic speeds and road type. The toolkit produces link by link source apportionment covering vehicle exhaust emissions, including brake and tyre wear contributions for PM10 and PM2.5.

Version 4.0 was released in January 2010, Version 4.1 was released in February 2010. Version 4.2 was released in June 2010, Version 4.2.1 was released in October 2010 and Version 4.2.2 was released in November 2010. Version 4.2.2 supersedes all previous versions and should be used for all new work.

Version 4.2.1 was issued on the 29th October 2010 to correct a minor error that occurred when modelling specific vehicle classes (e.g. buses only). On the 2nd November 2010, a further related error was identified. This is corrected by Version 4.2.2. The errors relate to PM10 and PM2.5 emissions due to brake and tyre wear and only affect emissions calculated using the 'Traffic Fleet' option. Emissions calculated using simple vehicle fleet statistics (i.e. %HDV) are unaffected; as are all NOx, HC and CO2 calculations. Local Authorities are not required to redo any work already carried out using previous versions but are advised to use version 4.2.2 for future work.

Previous versions of the old Emission Factor Toolkits are still available (but should not be used for new projects):

EXEMPT Model - Dealing with cold start emissions

The EXEMPT Model is in two parts, both parts are an evolution of the previous TRAMAQ3 EXEMPT Model 4. The models can be used as simple tools for assessing the effects of certain types of developments, for example, a new out-of-town shopping complex, the effects of .the school run. or changing a city centre car park, where many cars may make their journey with cold engines. The models give results as excess emissions (units of mass per metre driven) for up to 10 kilometres from the vehicles. starting point, not concentrations (mass in air). Further work is required independently of the model to calculate concentrations.

Each model comprises an MS Excel spreadsheet and accompanying user guide. Users are strongly advised to read the user guide and study the worked examples in this guide before they incorporate emissions from this model into a larger modelling study.