Revised Emission Standards for Motor Vehicles

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DENR ADMINISTRATIVE ORDER NO. 51, S. 2003: Revised Emission Standards for Motor Vehicles

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Title Supreme Court: Revised Emission Standards for Motor Vehicles

Law: Denr Administrative Order No. 51, S. 2003

Decision Date: Oct 29, 2003

The Department of Environment and Natural Resources establishes revised emission standards for in-use motor vehicles with spark ignition and compression ignition engines, requiring compliance for vehicle registration renewal to enhance air quality in line with the Clean Air Act.

emission standards

environmental law

administrative order

A

Purpose

To align emission standards for existing (in-use) motor vehicles with those set for new motor vehicles
Ensures that in-use vehicles meet emission levels as specified in their certificate of conformity issued by the Environmental Management Bureau (EMB)

Scope and Coverage

Applies specifically to in-use motor vehicles with spark-ignition and compression-ignition engines, excluding motorcycles
Covers emission standards detailed particularly in Tables 16 and 17 of Section 1, Rule XXXII of DAO 2000-81

Definitions

Spark Ignition Engine: Internal combustion engine ignited by a spark plug, including gasoline, LPG, and CNG engines
Three Way Catalytic Converter: Pollution control device in vehicles reducing carbon monoxide (CO), hydrocarbons (HC), and nitrogen oxides (NOx) emissions
Other terms used follow definitions in DAO 2000-81

Emission Standards for In-Use Vehicles

Vehicles must pass emission tests to renew registration with the Department of Transportation and Communications (DOTC) / Land Transportation Office (LTO)
Testing done at Motor Vehicle Inspection Stations (MVIS) or accredited centers in compliance with R.A. 7349 (Consumer Act of the Philippines)
Tests conducted within 60 days prior to registration renewal

For Spark Ignition Engines (Except Motorcycles):

Registered on or before December 31, 2002:
- CO limit: 4.5% by volume at idle
- HC limit: 800 ppm as hexane
Registered on or after January 1, 2003:
- CO limit: 3.5% by volume at idle
- HC limit: 600 ppm as hexane or as per manufacturer specification

For Compression Ignition Engines:

Emission standard specified as Light Absorption Coefficient of 2.5 m-1
Applies to both naturally aspirated and turbocharged engines
Testing method is free acceleration test

Test Procedures

Procedures for emission measurement for both spark and compression ignition engines detailed in Annexes B and C of DAO 2000-81

Effectivity

The Administrative Order takes effect fifteen (15) days after its publication
Publication required in the Official Gazette or a newspaper of national circulation

Enforcement and Compliance

Renewal of vehicle registration strictly conditional on passing emission tests
Encourages environmental protection through regulation of vehicular emissions
Supports the Philippines Clean Air Act and its implementing rules for air quality improvement

END