The measures on the long list have been assessed against a set of criteria provided by the government’s Joint Air Quality Unit (JAQU).  These criteria are based on the HM Treasury Green Book.
Firstly, measures unlikely to achieve NO2 compliance within the timeframe  were removed from the long list. Remaining measures were then assessed against a multitude of criteria, including: public health impacts; social impacts; economic impacts and scheme cost.   A copy of the scoring table for each measure against the assessment criteria is available as part of the Strategic Outline Business Case.