Reduced harmful emissions from transport
Nitrogen dioxide is the only transport generated emissions pollutant which is currently monitored around the region and used to report on emission trends. The figure shows the results from Nitrogen dioxide monitoring sites, the level is calculated using a five year average. The data are obtained from the NZTA’s network of air quality monitoring sites which cover state highways and local roads.
The NO2 data is measured using passive samplers at chosen sites in all areas around the region except the Wairarapa. Since 2013 there has been a downward trend in the level of nitrogen dioxide; overall there has been a 7% reduction in NO2 during this time.