If you use assistive technology (such as a screen reader) and need a
version of this document in a more accessible format, please email email@example.com.
Please tell us what format you need. It will help us if you say what assistive technology you use.
This document gives guidance on environmental impact appraisal.
The air quality valuation workbook was updated in May 2019.
This Transport Analysis Guidance (TAG) unit was updated May 2019 to incorporate Defra released guidance on the valuation of transport-related air quality impacts, covering a range of different impact pathways and transport modes. A new workbook to aid in the calculation of monetised impacts of air quality was also published alongside this update.