Comment submitted by China WTO/TBT National Notification & Enquiry Center

Summary: The People's Republic of China (represented by its Ministry of Commerce) opposes the proposed phase-in schedule for Tier 4 standards, requesting a three-year extension for Tier 3 standards to the 2029 model year to allow manufacturers more time for compliance. They also argue that the proposed vehicle definitions for light and medium-duty vehicles should be aligned with global mainstream standards (UN WP.29) to ensure harmonization and reduce costs for automakers.