|Exposure Limit||Limit Values||HE Codes||Health Factors and Target Organs|
|OSHA Permissible Exposure Limit (PEL) - General Industry See 29 CFR 1910.1000 Table Z-1||5 mg/m3 TWA||HE19||Physical irritation*|
|OSHA PEL - Construction Industry||Not established|
|OSHA PEL - Shipyard Employment See 29 CFR 1915.1000 Table Z-Shipyards||5 mg/m3 TWA||HE19||Physical irritation*|
|National Institute for Occupational Safety and Health (NIOSH) Recommended Exposure Limit (REL)||5 mg/m3 TWA||HE10||Lung changes that may lead to pulmonary fibrosis|
|American Conference of Governmental Industrial Hygienists (ACGIH) Threshold Limit Value (TLV) (2008)||1 mg/m3 TWAA4||HE7||Neurotoxicity|
|HE11||Lower respiratory tract irritation|
|CAL/OSHA PEL||5 mg/m3 TWA|
* Health factors for the PELs are not specific to aluminum but are the basis for OSHA's generic limits for particulates.
Date last revised: 9/6/2012
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