Relating to the requirement for a motor vehicle emissions test on resale of certain vehicles.

HB 5359 requires the Texas Commission on Environmental Quality to study whether increasing the mileage exemption for motor vehicle emissions testing (currently 50,000 miles) would harm air quality. The commission must publish study results online and propose a rule raising the exemption to the next 5,000-mile increment (e.g., 55,000 miles) if it won’t negatively impact Texas’ air quality plan. This bill does not change current testing requirements but establishes a process for potential future adjustments. It directly affects the commission’s regulatory process, not vehicle owners or dealers, and takes effect September 1, 2025.