Annotated PELs Tables: OSHA's annotated PELs tables include a side-by-side comparison of OSHA PELs, Cal/OSHA PELs, NIOSH RELs and ACGIH® TLVs® . The TLVs®  in the annotated tables are reprinted with permission from ACGIH®. See Important Note on ACGIH® TLVs®, which is also reprinted with permission from ACGIH®. Cal/OSHA, NIOSH, and ACGIH have OELs in addition to those listed in the annotated tables. The annotated tables contain links to the complete OEL lists from Cal/OSHA and NIOSH. TLVs® and BEI®s are not publicly available, but can be purchased on ACGIH®'s website. For the most current OELs and information on notations such as skin absorption, users should consult complete listings and explanations from Cal/OSHA, NIOSH, and ACGIH. Each of the alternative lists of exposure limits is accompanied by extensive explanatory language on their source websites. These include averaging periods, size selective measures and similar information. In particular, ACGIH® provides an explanation of the use of TLVs® and access to documentation. For more information and documentation, consult with these organizations. See more from topic source: https://www.osha.gov/html/a-z-index.html