Many councils will have historical profiles which have been developed using various different methodologies and data sets. There may be differences in the methodologies applied, and it should be noted that many profiles will not have been developed in line with the GPC standards.
If you have an independently developed profile that you feel presents a discrepancy then please send it to us and we will assess inclusion within the Snapshot database on an individual basis.
There are several municipalities that have completed detailed emissions profiles which have been verified. In their case, the results have been hard coded into the tool, and these results are provided in place of the Snapshot profile.