The principal route of exposure to arsenic for the general pop- ulation is likely to be the oral route, and exposure to arsenic from other pathways is generally small, but may be significant for areas with high levels of arsenic contamination particularly in occupational settings. Increased risk of lung cancer, respiratory irritation, nausea, skin effects, and neurological effects have been reported following inhalation exposure [39]. Human data suggest that dermal or respiratory effects may be the most prevalent [40,41]; respiratory or immunological effects appeared to be the most common following inhalation exposure to inorganic arsenic in animals [42]