<prompt> According to OSHA, maximum permissible amount of Ni in dental clinic environment is?1 mg2 mg3 mg4 mg  <response>: The former OSHA Permissible Exposure Limit for all forms of inorganic nickel as Ni was 1 mgm3 TWA. Based on the ACGIH recommendation, OSHA proposed revising this limit to 0.1 mgm3 TWA; this limit is established in the final rule. NIOSH recommends that exposure to any form of inorganic nickel be maintained at or below 0.015 mgm3.Ref: 