What are the compliance mandates for mobile sources of air pollution?

 Exhaust emission standards for various mobile sources that are either in-use, new, rebuilt, and imported second-hand have been set.

   All new motor vehicles classified under the Philippine National Standards 1891 of the Bureau of Product Standards of the Department of Trade and Industry, whether locally assembled/manufactured or imported are to be covered by a Certificate of Conformity (COC). The COC is to be issued by the DENR to the motor vehicle manufacturer, assembler or importer.

   In-use motor vehicles will only be allowed renewal of their registration upon proof of compliance with emission standards through actual testing by the Motor Vehicle Inspection System (MVIS) of the DOTC/LTO, and authorized private emission testing centers.

   On the other hand, rebuild motor vehicles or imported second-hand completely built-up or pre-regulated vehicles retrofitted with secondhand engines will only be allowed registration or renewal of registration upon submission of a valid Certificate of Compliance to Emission Standards (CCES) issued by the DOTC. The CCES will only be issued if the exhaust emission standard for that specific motor vehicle is met, as verified by actual testing through the MVIS. 

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Lifted from:

Department of Environment and Natural Resources. (2003, August). Primer on the Clean Air Act. Diliman: DENR-Public Affairs Office.