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H.R. 9618 (119th Congress)Committee
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DEF Act

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Summary

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The DEF Act amends the Clean Air Act to establish a 10-year regulatory freeze on vehicle and engine emission standards for on-road and nonroad diesel engines, preventing the EPA from promulgating standards more stringent than 2007 and 2010 standards during this period. The bill creates a safe harbor for manufacturers implementing inducement strategies and diesel exhaust fluid monitoring consistent with specified EPA guidance documents. After the 10-year period expires, any new emission standards must provide at least 5 years of lead time before taking effect and must consider factors including operational disruption, equipment durability, resale value, and cost impacts on owners and operators.

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