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  Environment » Environmental Information » Environmental indicators » Air: monitoring and reporting » Sulphur dioxide levels in air » Results - data and trends

Results - data and trends

The link below points to an Excel file that contains the source data to this indicator's graph and any additional data.

Download the data file

The graph and table below shows the percentage of air samples with sulphur dioxide levels in the ‘excellent’, ‘good’, ‘acceptable’, ‘alert’ and ‘action’ categories relevant to the regional and national guidelines for the year 2012 as measured at the Ohaupo Road (Blood bank) monitoring station. Tokoroa results are measured at the Billah Street reserve monitoring station 2017 to 2018. All samples (100%) were within the ‘excellent’ category. Data for the 1 hour average are presented relative to the regional and national guideline of 350 µg/m3.

Table one: comparison of one-hour average sulphur dioxide levels measured in Hamilton (2012) and Tokoroa (2017-2018) to air quality indicator categories. 



0-10 percent guideline


0-33 percent of guideline


33-66 percent of guideline


66-100 percent of guideline


>100 percent of guideline

Hamilton 2012 100 percent 0 0 0 0
Tokoroa 2017-2018 100 percent 0 0 0 0


Percentage of air samples with sulphur dioxide levels in the excellent, good, acceptable, alert, or action categories

 sulphur dioxide results graph

  • The data were collected in Hamilton from 1 March 2012 to 31 August 2012 and averaged 1 hourly.
  • The data were collected in Tokoroa from 1 December 2017 to 31 May 2018 and averaged 1 hourly.
  • Find out more about air quality(external link) around the Waikato region.
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