The California Air Resources Board (CARB) has notified the Environmental Protection Agency (EPA) that it has finalized its ``Omnibus'' Low NO<INF>X</INF> Regulation, which establishes criteria pollutant exhaust emission standards for new 2024 and subsequent model year on-road medium- and heavy-duty engines and vehicles. The regulation also establishes emissions-related requirements for off-road engines. By letter dated January 31, 2022, CARB submitted a request that EPA grant a waiver of preemption and an authorization under the Clean Air Act (CAA) for this regulation. This notice announces that EPA has scheduled a public hearing concerning California's request and that EPA is accepting written comment on the request.