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Reduced harmful emissions from transport

http://www.gw.govt.nz/reduced-harmful-emissions-from-transport

Reduced harmful emissions from transport

Updated 13 February 2020 2:01pm

Target: Transport generated emissions (per capita) reduces to 15% of 2013 levels.

Target: Transport generated emissions (absolute) reduces to 10% of 2013 levels.


Transport generated CO2 emissions per capita.
Source: GWRC
This figure shows represents both measures associated with transport generated CO2 emissions. These are CO2 per Kilotonnes (LHS) and CO2 emissions per capita (RHS). CO2 per Kilotonnes (shown as blue bars above) have increased since 2013. The five year trend-line (black line) for emissions per kilotonnes, is trending upward. The level of CO2 emissions increasing overall since 2014 and rising above the previous peak in 2005 - in 2016. The CO2 emissions per capita trend-line shows an upward trend also but not as steep. In 2018/19, CO2 emissions were 1,200 kilotonnes and 2.3 tonnes per capita.

Target: Concentrations of harmful transport generated pollutants reduces from the 2009-2013 average.

NO2 monitoring across the region - five year rolling average

Source: GWRC/NZTA

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 sites16 which cover state highways and local roads. The NO2 data is measured using passive samplers17 at chosen sites in all areas around the region
15 Carbon dioxide emission levels have been calculated from fuel consumption data using production rates from the Ministry of Economic development greenhouse gas emissions report (2010). The factors are 2.31 Kg/L of CO2 per litre of petrol and 2.64 kg/L for diesel.
16 Passive diffusion tubes
17 NZTA Ambient Air Quality (Nitrogen Dioxide) Monitoring Programme – Operating Manual 2013/14: Passive sampling techniques are ‘screening’ methods and are useful for spatial and temporal assessments. However, any elevated NO2 concentrations identified by passive sampling techniques are only
2014/15 Annual Monitoring Report on the Regional Land Transport Plan
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except the Wairarapa. There are only two years of data for this measure so it is too early to determine any trend. In the future it is likely that the downward impact on fuel consumption from vehicle fleet efficiency improvements, including improvements to the bus fleet, will outweigh the impact on fuel consumption of population growth (generating additional vehicle trips) and any per capita increase in private car and freight VKT that might occur, resulting in a steady reduction in per capita CO2 emissions and a similar reduction in absolute annual transport-generated CO2 emissions. The rate of reduction, however, will depend on several factors including growth in car VKT, modal shift from car to public transport, government policies and external factors such as the price of fuel. One of the aims of this of this RLTP objective is to improve the reporting and monitoring framework to include the monitoring of pollutants CO, PM10 and PM25. Research is underway to develop a new improved indicator for future RLTP reporting.

Nitrogen dioxide is a transport generated emissions pollutant which is currently monitored around the region and used to report on emissions harmful to human health. 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; the 2018 result is 20.5 µg/m-3, overall there has been a 8% reduction in NO2 over this time.