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Nitrogen dioxide concentrations data: Categorisation and standardisation

Publication date:  October 2018
Publication reference number:  CR 322

This report supports the provision of nitrogen dioxide concentrations data. It describes the methods used to obtain these data in sufficient detail for Stats NZ to complete a quality assurance process. In particular this report describes how measurement sites have been classified in terms of their representativeness, and how a ‘roadside adjustment’ has been applied at some sites to try to reduce bias introduced by the variation in distances of different measurement sites from major roads. This report also describes limitations associated with the data.