The main purpose of this legislation is to update the definition of renewable biomass in the Clean Air Act. This change aims to support the renewable fuel standard, which encourages the use of cleaner fuels to reduce air pollution and promote environmental sustainability. The legislation is designed to facilitate the use of biomass materials that can be sourced from forest management practices, particularly those that help reduce wildfire risks. Key provisions of the legislation include a more detailed definition of what constitutes renewable biomass.