Emissions of heavy metals from the industries and vehicles may
be deposited on the vegetable surfaces during their production,
transport and marketing. Jassir et al. (2005) have reported elevated
levels of heavy metals in vegetables sold in the markets at Riyadh
city in Saudi Arabia due to atmospheric deposition. Recently, Sharma
et al. (2008a,b) have reported that atmospheric deposition can
significantly elevate the levels of heavy metals contamination in
vegetables commonly sold in the markets of Varanasi, India.