where Cmetal is the concentrations of heavy metals in crops
(mg kg_1), Wfood represents the daily average intake of vegetables
and Bw is the body weight. The conversion factor to convert fresh
green vegetable weight to dry weight was taken as 0.085. The
average adult and children body weights were considered to be
55.9 and 32.7 kg, respectively. The average daily vegetable intakes
for adults and children were taken as 0.345 and 0.232 kg, respectively
(Arora et al., 2008). Generally, the index value less than unity
(1.0) shows safe levels while the values higher than1.0 are associated
with adverse health effects.