Core Viewpoint - The article highlights the issue of illegal modifications to heavy-duty trucks that significantly increase their emissions, particularly through the installation of a small screw on the exhaust temperature sensor, which prevents the proper functioning of the vehicle's emissions control system [1][3][5]. Group 1: Illegal Modifications and Their Impact - The installation of a screw on the exhaust temperature sensor can lead to a substantial increase in nitrogen oxide emissions, making a single modified truck equivalent to the emissions of several compliant trucks [3][4]. - Despite increased enforcement efforts, illegal modifications are still prevalent, with reports of such practices across multiple provinces in China [2][4]. - The environmental impact is significant, as heavy-duty trucks account for over 80% of nitrogen oxide emissions from motor vehicles, contributing to air pollution [3][7]. Group 2: Enforcement and Regulatory Measures - Local enforcement agencies have intensified inspections, but illegal modifications continue to undermine environmental efforts, necessitating a coordinated approach among various regulatory bodies [4][8]. - The central government has issued guidelines to strengthen the regulation of diesel truck emissions, including regular checks for unauthorized modifications [7][8]. - Legal experts emphasize the need for stricter penalties against online sales of illegal modification parts, which violate consumer protection laws [7]. Group 3: Economic Incentives for Modification - Truck drivers are motivated to modify their vehicles due to significant cost savings on urea, with annual expenses potentially reduced by thousands of yuan [5][6]. - Online platforms are facilitating the sale of these illegal modification kits, often accompanied by instructional content, making it easier for drivers to perform the modifications themselves [6][7]. Group 4: Future Directions and Solutions - There is a call for a comprehensive approach to tackle the issue, including collaboration between environmental, transportation, and market regulatory agencies [8]. - Encouraging the adoption of new energy heavy-duty trucks is suggested as a long-term solution, as the cost gap between electric and diesel trucks is narrowing [8].