US Federal - Marine

Status

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Tier 3 standards for category 1 and 2 marine diesel engines were introduced between 2009 and 2014; Tier 4 standards are being phased in since the 2014 model year. Category 3 engine NOemissions are governed by EPA Tier 1, 2 and 3 standards, which are consistent with the International Maritime Organization standards.

The current recreational marine spark ignition engines standards have been in place since the 2010 model year, configured separately for out-board and sterndrive / in-board engines. 

Emissions standards - commercial engines

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Engine categories

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Applicability

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Categories 1 and 2 emissions standards

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Proposed amendments - Tier 4 standards

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Not-to-exceed standards

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Averaging, banking and trading

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Category 3 emissions standards

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Emissions standards - recreational engines

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Diesel engines

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SI outboards and personal watercraft

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SI stern drive and in-board engines

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Evaporative emissions

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Test Procedures - commercial engines

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Gasoline

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Diesel

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Test Procedures - recreational engines

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Gasoline

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Diesel

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Historical Data

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Tier 2

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Recreational Marine

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References

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Last update: 16/10/2019