Paje said the planned shift to Euro 4 was made possible through the support of oil players, car manufacturers and transport groups, who are doing their fair share to curb air pollution and reduce its impacts. “Low sulfur fuels will lead to reduced emissions of particulate matter. This particulate matter, along with other pollutants, can penetrate deeply into sensitive parts of the lungs and can worsen existing respiratory and heart dis eases,” the environment chief explained.
The DENR Administrative Order No. 2015-04 issued by Paje provides more stringent emission standards for carbon monoxide (CO), hydrocarbon, oxides of nitrogen , and particulate matter to be complied with by new passenger, and light – and heavy – duty vehicles. For instance, the Order sets an average CO emissions limit of 2.0 grams per kilometer (g/km) for gasoline – fed passenger and light – duty vehicles instead of 2.2 g/km , and 0.9 g/km for those using diesel instead of 1.0 g/km. It also provides that all new vehicles to be used or introduced into the Philippine market by January 2016 shall be equipped with Euro 4 engine and compliant with Euro 4 emission standards.
The DENR-Environmental Management Bureau shall issue Certificates of Conformity (COC) only to Euro 4/IV vehicles starting January 2016.
COC is issued to new vehicles that complied with the emissions standards prescribed by the DENR. It is a requirement for initial registration of vehicles with the Land Transportation Office.

The Department of Energy is enjoined to ensure the availability of Euro 4 fuels to comply with the new emissions standards by July 1. Paje said the implementation of vehicle emission limits is consistent with Republic Act No. 8749, or the Philippine Clean Air Act of 1999