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• <br />v <br />Nickel <br />Nickel is a silvery grey, metallic (or darker),.odorless powder. <br />Exposure to nickel can cause pneumonitis. Nickel and its compounds <br />have also been reported to cause cancer of the lungs and sinuses. <br />Nickel itself is not very toxic if swallowed. <br />The TWA of the PEL for nickel is 1 mg/m3. <br />43 <br />