Heavy metal exposure occurs significantly by occupa-tional exposure.
Workers of the mining and production of cadmium, chromium, lead
,mercury, gold and silver have been reported to be thus exposed; also inhabitants
around industrial sites of heavy metal mining and processing
,are exposed through air by suspended particulate
matters (SPM) (Heyer, 1985; USDOL, 2004; Ogwuegbu
and Muhanga, 2005).