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Air dispersion models are often used to assess potential air quality impacts arising from major roading projects. Detailed predictions of concentrations can be made over a wide area, as a supplement to (or instead of) monitoring which is usually only available at isolated locations.

In order to run a dispersion model, you need input data on the meteorology, emissions, local topography and sometimes ambient or background concentrations of pollutants. Meteorology is critical as it influences how pollutants disperse and dilute in the atmosphere. The most important parameters are wind direction, wind speed, turbulence and vertical mixing.

The Transport Agency and Auckland Council have developed a specific meteorological dataset(external link) for use in assessing air impacts for roading and other projects in Auckland. However, datasets are also available for other regions in New Zealand.

The list where meteorological datasets are available [DOC, 68 KB] around the country may be useful in air quality assessments for state highway projects. 

For further information contact environment@nzta.govt.nz.