| Existing Air Quality Effects | Waihi North Project Air Discharge Assessment - Waihi Surface Facilities | 4396626-1331619777-99 | 16/06/2022 | 47 6.2.2 Total Suspended Particulate (TSP) monitoring data Table 6-4 summarises the average, maximum, minimum and median, 7-day average TSP concentrations for the period January 2005 to December 2020. The distribution of the 7-day average TSP concentrations is shown in Figure 6-5 by box and whisker plots. The “boxes” in the figure show the median, upper quartile and lower quartile monthly deposition rates (i.e. the 50th, 75th and 25th percentiles) recorded at the monitoring sites. The ‘whiskers’ show the highest and lowest deposition rates observed during the monitoring, excluding outlier values. The outliers are shown in the figure as circles40. Figure 6-6 shows the time series of the 7-day average TSP data over the monitoring period. Table 6-4. Distribution of 7-day average TSP concentrations (µg/m3) (2005-2020) Monitoring Location Average Maximum Minimum Median 6.61 (Grey Street) 12.4 43.6 0.5 11.8 6.63 (Met Station) 15.1 84.9 0.3 13.1 6.64 (Courthouse) 13.3 61.6 0.2 12.7 6.65 (Old House) 11.3 33.2 0.2 10.6 6.66 (College) 10.5 37.6 0.6 10.5 6.78 (Slevin St) 12.5 46.2 1.2 11.9 Figure 6-5. Box and whisker plot of 7-day average TSP concentrations (µg/m3) monitoring data (January 2005 – December 2019) 40 Outliers are defined as values which are higher than the upper quartile plus 1.5 x the interquartile range (or the highest value in the data set – whichever is lowest), or lower than the lower quartile minus 1.5 x the interquartile range (or the lowest value in the data set, whichever is highest)
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