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Figure 9.6 Variation of respirable dust index with ash content.
9.4.3 Effect of Ash Content
The variation of RDI with ash content is shown in Figure 9.6. In spite of the scatter in
data, a downward trend with increasing ash can be discerned.
9.4.4 Effect of Fusain Content
Figure 9.7 shows the variation of RDI with fusain content. There is a progressive
increase in RDI as fusain content increases from 2.5% to 25%.
Figure 9.7 Variation of respirable dust index with fusain content.
