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Remote sensing devices are used to measure 'real world' emissions from motor vehicles. Roadside remote sensing is useful for identifying and assessing the key trends that influence the emissions performance of vehicle fleets. Regular monitoring highlights critical or emerging trends that may require future policy interventions.

The Transport Agency, along with Auckland Council and the Ministry of Transport, have been using remote sensing devices to measure emissions of the light duty vehicle fleet in Auckland since 2003. The latest campaign undertaken in 2011 conducted monitoring at seven roadside sites across the Auckland region for 10 days, and measured emissions of:

  • carbon monoxide (CO),
  • nitric oxide (NO),
  • hydrocarbons (HC) and
  • uvSmoke (which is used as an indicator of particulate matter – PM10).

All data collected so far have been collated into an on-road vehicle emission database that is publically available from NIWA ( All reports can be accessed below.

The Transport Agency has recently commissioned a follow-up research study – Understanding trends in vehicle emissions – which will involve a repeat monitoring campaign in Auckland in early 2015. The research project is being led by Golder Associates ( and results were due to be published in December 2015.

For further information contact