OSHA is initiating a new regulatory project to revoke a small number of obsolete permissible exposure limits (PELs) for chemicals contained in the 29 CFR 1910.1000 Table Z-1. This project is in accordance with Executive Order 13563, which is intended to facilitate the review of existing regulations that may be outmoded, ineffective, insufficient, or excessively burdensome, and to modify, streamline, expand, or repeal them. As the agency has previously discussed in its Request for Information on Chemical Management and Permissible Exposure Limits (RIN: 1218-AC74), there is widespread agreement among industry, labor, and professional occupational safety and health organizations that OSHA's PELs are outdated. In particular, the Agency will propose revocation of a small number of chemical PELs for which the OSHA PEL substantially exceeds other recommended occupational exposure limits and for which the agency has evidence that workers are not generally being exposed at a level approaching the OSHA PEL (e.g., employers have not been cited for violation of the PEL for some time). The agency is particularly concerned that the continued existence of these obsolete PELS imparts a false level sense of security to workers and employers who mistakenly believe that the PEL represents the level at which there are no adverse health effects. The agency expects that upon revocation of these outmoded and ineffective PELS that it may use other enforcement tools (e.g., the General Duty clause) in limited circumstances should worker health and safety be jeopardized.