The main purpose of this legislative text is to express Congress's disapproval of a specific rule issued by the Environmental Protection Agency (EPA). This rule pertains to pollution control standards for motor vehicles and engines in California, specifically focusing on regulations aimed at reducing nitrogen oxide (NOx) emissions. Key provisions of this resolution include the formal disapproval of the EPA's rule, which is identified as the "Omnibus Low NOx Regulation." By passing this resolution, Congress is stating that the rule will not be enforced and will have no legal effect.