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The Environmental Protection Agency (EPA) proposes to approve Idaho's updated regional haze State Implementation Plan (SIP) for the period from 2018 to 2028. Idaho's plan aims to make progress toward improving visibility caused by air pollution in national parks and wilderness areas. The plan includes specific strategies and rules for sources of air pollution, such as factories, to reduce emissions of harmful substances like nitrogen oxides and sulfur dioxide. The EPA found Idaho’s plan to be consistent with federal requirements and intends to incorporate the plan's measures into the state’s legally enforceable air quality rules.

The Environmental Protection Agency (EPA) has issued a final decision to partially approve and partially disapprove Utah's plan to address regional haze, which affects air quality in national parks and wilderness areas. The EPA found Utah's plan partially insufficient as it failed to meet certain requirements, such as implementing stronger controls on emissions from specific power plants. Additionally, the EPA disapproved parts of Utah's plan addressing visibility pollution related to ozone levels from a 2020 submission. This ruling emphasizes the need for stronger measures to protect visibility and air quality in protected areas.

The Environmental Protection Agency (EPA) has granted the California Air Resources Board (CARB) the authority to make amendments to its regulations for fleets of diesel-fueled, off-road vehicles. These changes, known as the 2022 Off-Road Fleets Amendments, aim to phase out old and high-emitting vehicles and require the use of specific renewable diesel. These regulations will be implemented between 2024 and 2036 to support California's emission reduction goals. The decision was made under the Clean Air Act, which allows California to have stricter standards for nonroad engines as long as they meet certain federal conditions.