Although the U.S. Environmental Protection Agency (EPA) was able to block the funding for 15 months, a study of I/M (inspection/maintenance) emissions-test effectiveness by the National Academy of Sciences (NAS), authorized by Congress in October 1997, is under way at long last. This raises the hope that the often acrimonious conflict between the states and the EPA over emissions testing of in-use vehicles will be replaced by scientifically sound, independently derived fact-based policies ...

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