Annual average nitrogen dioxide concentration in New Zealand

For select locations, 2002–2012, micrograms per cubic metre of air

Notes

Note: Nitrogen dioxide concentrations are given in micrograms per cubic metre of air, or µg/m3.

Source: Auckland Council, Wellington Regional Council

From 2014 Air domain report for the Ministry for the Environment by Statistics New Zealand

Case study: Nitrogen dioxide

Related topic: Concentration of gases (state)

Indicator definition: Annual average nitrogen dioxide concentrations at three location types: state highways; (busy) local roads; and urban background sites.

Background: Nitrogen dioxide is a gas and can be directly emitted into the air. It is more commonly formed, however, from nitric oxide being emitted into the air and then reacting with other air pollutants. Both nitrogen dioxide and nitric oxide (collectively known as nitrogen oxides) are emitted from the combustion of fossil fuels (coal, gas, and oil) and from natural sources such as volcanoes.

Exposure to high nitrogen dioxide concentrations are linked to asthma symptoms and reduced lung development and function in children.

Presentation of indicator components: Annual average concentration of nitrogen dioxide (micrograms per cubic metre) at three location types:
state highways
busy local roads
urban background sites.

Methodology: Information is obtained from the New Zealand Transport Agency’s (NZTA) nitrogen dioxide monitoring network.

The network consists of approximately 130 monitoring stations over 2010–12. Monitoring stations are located in each region and cover all the main urban areas, as well as other urban areas. The network uses passive monitoring to determine nitrogen dioxide concentrations.

Information is only included if the site achieves a greater than 75 percent valid data rating to help ensure the data is representative of the location.

For more information on the monitoring methodology used for the NZTA monitoring network see the National air quality (NO2) monitoring network information on NZTA’s website.

Data coverage: Approximately 130 monitoring sites that cover many locations. The population coverage of the monitoring network is unknown, meaning a nationally representative average cannot be compiled.

Data source: NZTA monitoring network

Limitations to data and analysis, including level of confidence: Only one gas is reported.

The NZTA monitoring network uses a screening method which provides results that cannot be compared directly to WHO long-term guidelines.

For more information on this and other limitations see the National air quality (NO2) monitoring network information on NZTA’s website.

The population coverage of the monitoring network is unknown.
Changes to time series Minor changes in monitoring sites during the reported period.

Definitions

Detailed definitions can be found here: http://www.mfe.govt.nz/more/environmental-reporting/air/air-domain-report-2014/data-and-supporting-information/about

Data provided by

Ministry for the Environment

Dataset name

Environmental Reporting: Air Domain Report 2014

Webpage:

http://www.mfe.govt.nz/more/environmental-reporting/air/air-domain-report-2014/data-and-supporting-information/data-files

How to find the data

At URL provided, download 'Excel files'

Import & extraction details

File as imported: Environmental Reporting: Air Domain Report 2014

From the dataset Environmental Reporting: Air Domain Report 2014, this data was extracted:

  • Sheet: Table 13
  • Range: C11:G21
  • Provided: 43 data points

This data forms the table Air Domain Report - Annual average nitrogen dioxide concentration at selected locations 2002-2012.

Dataset originally released on:

May 16, 2014

Purpose of collection

The Ministry for the Environment and Statistics New Zealand commissioned NIWA to produce a report that provides information for New Zealand’s Environmental Reporting Series: 2014 Air domain report. This report provides the methodology and results for the national air domain indicators – on-road vehicle emissions, annual average PM10, and health impacts due to exposure to PM10. It also includes information on natural sources of pollutants, and the influence of meteorological conditions on air quality.