Preamble
WHEREAS, the increasing use of motor vehicles is fast becoming a major source of the growth in the amount and complexity of air pollution in the country, particularly in urban areas; WHEREAS, this phenomenon is best exemplified by the emission of carbon monoxide, participates, sulphur dioxide and other associated pollutants from about 400,000 registered vehicles of all types in the Metro Manila amounting to some 4,000 metric tons a day, which accounts for over 75 per cent of the total air pollution in the area; WHEREAS, such air pollution poses mounting dangers to public health and welfare, damage to and deterioration of property, the hazards to land transportation; and WHEREAS, it is necessary to take immediate action and institute appropriate measures to regulate the emission of air pollutants from motor vehicles —a hitherto uncontrolled major source of air pollution. NOW, THEREFORE, I , FERDINAND E. MARCOS , President of the Philippines, by virtue of the powers in me vested by the Constitution, do hereby order and decree the following: