5.3 Results
Within the limited scope of this study, the measured levels of all metals were low and generally below recognised international goals, although direct comparison with annual goals was not possible.
All results (Table 11) are reported as nanograms per cubic metre (ng/m3) where 1 nanogram is 1 x 10-9 grams or 0.000000001 g. They showed that:
- beryllium was below the limit of detection at all sites
- cadmium, cobalt and selenium were detected at 1 ng/m3 or less at all sites
- antimony and arsenic were detected at less than 5 ng/m3 at all sites
- the remaining six metals-copper, lead, manganese, nickel, vanadium and zinc-accounted for over 95% of the total metal concentration at any site.
Page last updated: 26 February 2011
