All samples were analyzed by using the electronic nose to identify the odour patterns and a
set of similarity index (SI) were figured out by the e-nose system software. The odour patterns
and SI between background samples are shown in the following figures and also summarized
in Table 5. The results indicate that all SI values are in the range of 5-40. The sample of
Boundary 1 had the least average SI value of 14.25, which should be the most representative
sample among the 5 boundary samples. To investigate the effects of different source wastes
on the atmosphere in the boundary samples, the second set of similarity analyses was also
carried out, in which Boundary 1 sample was used to be compared with other source samples.
The results about the similarity analyses are shown in Figs 2 and 3, and also summarized in
Table 6.