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Results - data and trends

The link below points to a file that contains the source data to this indicator's graph and any additional data. The file is in comma separated (csv) format and intended to be opened in spreadsheet software.

Download the data file
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The graph below shows that motor vehicles are the main source of nitrogen oxides in Hamilton, Tokoroa, Taupo Te Kuiti, Matamata, Putaruru, Ngaruawahia and Turangi. Industry is the main contributor to nitrogen oxide levels in Te Awamutu and Waihi.

  • All data were collected between 2004 and 2007.
  • Find out more about air quality around the Waikato region.


Graph showing the percentage of  nitrogen oxides in the air from industry, vehicles and home heating