Our approach to GHG measurement is to use best practices and globally recognised standards and emission factors wherever possible. Average carbon emissions for various activities are an important component of the AQ Green app offering. By providing these averages in the app, we can assist users that do not have their own activity data which reduces barriers to engagement and encourages progression in the app. Research is therefore an important part of our work, as we seek to establish the average emission profiles for the regions in which we promote the app. Where data is unavailable, we use a science-based approach to the collection of input data that will support a credible calculation for an average.