Per Republic Act No. 8749 otherwise known as the Philippine Clean Air Act, the Department of Trade and Industry (DTI) is mandated to develop and implement standards and procedures on the licensing of qualified private service centers and their technicians as prerequisite for performing the testing, servicing, repair and the required adjustment to the vehicle continue reading : DTI-4A and DTI-Laguna conduct onsite assessment of PETCs in the cities of Cabuyao and Calamba