There are about 250 million personal vehicles in the United States. Assume
that each drives 25,000 km per year on average. What is the average reduction in NOx emissions per square kilometer per year resulting from the implementation of the 2004 U.S. emission standards compared with the situation before any standards were introduced (1960)?

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The Answer of There are about 250 million personal vehicles in the United States. Assume
that each drives 25,000 km per year on average. What is the average reduction in NOx emissions per square kilometer per year resulting from the implementation of the 2004 U.S. emission standards compared with the situation before any standards were introduced (1960)?

There Are About 250 Million Personal Vehicles in the United