National Emissions Standards Act
The Motor Vehicle Air Pollution Control Act is a 1965 amendment to the U.S. Clean Air Act of 1963. The amendment set the first federal vehicle emissions standards, beginning with the 1968 models. These standards were reductions from the 1963 emissions: 72% reduction for hydrocarbons, 56% reduction for carbon monoxide, and 100% reduction for crankcase hydrocarbons. The impact the regulatory standards will have on air quality in the future, as well as the potential characteristics of the vehicle fleet can be analyzed with the use of roadway air dispersion models.
The U.S. Environmental Protection Agency (EPA) is a department specific to the Clean Air Act. Its purpose is to make sure the amount of air pollution emitted stays inside the standards set by the U.S. Each state is required to have a state implementation plan (SIPs) that clearly indicates how it will enforce the regulations of the Clean Air Act. The states have to create regulations of their own that also adhere to the guidelines of the U.S. regulations; in order to do so, they must hold hearings so the public can contribute ideas and provide feedback.
Read more about National Emissions Standards Act: Cleaning Up Commonly Found Air Pollutants, Cars, Trucks, Buses, and Non-road Equipment, Interstate and International Air Pollution, Reducing Acid Rain, Reducing Toxic Air Pollutants, Protecting The Stratosphere Ozone Layer, Permits and Enforcement, Public Participation
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