The bill exempts certain state agencies and local building departments from conducting greenhouse gas emissions analyses for specific appliances, vehicles, and engines under the Montana Environmental Policy Act (MEPA). It acknowledges that federal laws, such as the Clean Air Act and the Energy Policy and Conservation Act, preempt state regulations on greenhouse gas emissions and related matters. Consequently, the bill states that the purposes of MEPA cannot be fulfilled by analyzing emissions from these federally regulated sources, leading to their exclusion from MEPA review.

Specifically, the bill includes provisions that exempt the department and local building departments from analyzing greenhouse gases from covered products or appliances when adopting or enforcing building codes. Additionally, it clarifies that the department is not required to analyze greenhouse gas emissions beyond the state's borders for certain vehicles and engines, while removing the previous requirement to analyze emissions beyond state borders. This legislative change aims to streamline regulatory processes in light of existing federal preemptions.