1、1EPA. Office of Air and Radiation. Tier 2 Report to Congress. July 31, 1998. 55 p.2EPA. Federal Register. February 10, 2000. p. 6698-6870.Congressional Research Service The Library of CongressCRS Report for CongressReceived through the CRS WebOrder Code RS20247Updated June 12, 2000EPAs Tier 2 Emissi
2、on Standards forNew Motor Vehicles: A Fact Sheet(name redacted)Environmental Information AnalystResources, Science, and Industry DivisionThe Clean Air Act Amendments of 1990 established “Tier 1” standards to limittailpipe emissions from new motor vehicles. The law also required the EnvironmentalProt
3、ection Agency (EPA) to determine if stricter controls would be necessary by modelyear (MY) 2004 to assist states in attaining or maintaining the National Ambient AirQuality Standards. EPA also was required to assess the availability and cost-effectivenessof technologies necessary to control emission
4、s. In a report submitted to Congress inAugust 1998, EPA concluded that tougher standards are necessary and that essentialtechnologies are available and cost-effective.1 As a result, EPA finalized stricter “Tier 2”standards on February 10, 2000.2 The new standards will be phased in beginning inMY2004
