Odour Threshold Investigation 2012 - Bay of Plenty Regional Council

Effect of elevated ambient H 2 S
On 26 and 27 March, some testing was carried out at Rotorua when ambient H 2 S levels were
unusually high for the testing location. It has been proposed that the data from these periods
be removed. Figures 2 and 3 demonstrate that the affected period did show markedly
elevated detection thresholds in comparison to other results at about the same time, even
those for the same panellist. It is therefore justifiable to remove the data as proposed.
Unfortunately 31% (209/678) of the Rotorua data is lost. From now on our analyses are
based on the consequently “trimmed’ data set.
Figure 2
“affected” panellists have at least one result in the “suspect” period.
Environmental Publication 2012/06–A review of odour properties of H 2 S Odour Threshold Investigation 2012 63