California - Heavy Duty Vehicles - 1

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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 are broadly in line with those of the Federal EPA and refer to the same test procedures as required by Federal law, for both diesel and Otto-cycle engine vehicles. 

Content overview

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Vehicle categories

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Diesel engines and vehicles emissions standards

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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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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 emissions standards

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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: 10/11/2023