= Arsenic has been classified by International Agency for Research in Cancer (IARC) as a Group I carcinogen (human carcinogen).
= Chronic exposure to inorganic arsenic is a potential occupational hazard.
= Permissible exposure limit (PEL) is 10 µg/m3 for an 8-hr day (OSHA)
= Short-term exposure limit (STEL) is 2 µg/m3 for 15-min period (ATSDR,2006)
= Biological Exposure Index (BEI) of total arsenic in urine is 35 µg/l (ACGIH,2004)