California - Heavy Duty Vehicles

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California has its own emissions legislation which has been adopted by 13 other States as an alternative to the Federal standards. The current heavy duty emissions standards, which have been in place since 2008, are broadly in line with those of the Federal EPA and refer to the same test procedures as required by Federal law. New evaporative emission limits for spark-ignition engines are effective from the 2015 model year. 

CARB States

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Vehicle categories

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Diesel engines and vehicles

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Emissions limits

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Optional low NOx standards

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Durability requirements

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Smoke

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Refuelling emissions

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In-use requirements

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Idling requirements

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Test procedures - general

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Hybrid Electric Vehicle (HEV) test procedure

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Spark-ignition engines and vehicles

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Emissions limits

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Optional low NOx standards

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Evaporative emissions

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Refuelling emissions

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Test procedures

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Hybrid Electric Vehicle (HEV) test procedure

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On-board diagnostics

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Current requirements

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Future requirements

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Historical Data

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Evaporative Emissions

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On-board diagnostics - diesel

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On-board diagnostics - SI engines

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References

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Last update: 07/11/2019