The main purpose of this legislative text is to allow Congress to formally disapprove a specific rule put forward by the Environmental Protection Agency (EPA). This rule concerns the disapproval of Colorado's Regional Haze Plan for managing air quality over a designated period. Essentially, the resolution aims to prevent the EPA's rule from taking effect. Key provisions of this resolution include the explicit disapproval of the EPA's rule regarding Colorado's air quality management plan. By passing this resolution, Congress is stating that the rule will have no legal force or effect.