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Emissions requirements in California are regulated by CARB (California Air Resources Board). For many applications, CARB issues regulatory requirements separately from the EPA, although emissions standards might be aligned with the Federal ones. The previously applicable 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
• Optional low NOx standards
• Durability requirements
• Smoke
• Refuelling emissions
• Idling requirements
• Test procedures - general
• Hybrid Electric Vehicle (HEV) test procedure

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
• Optional low NO_X standards
• Evaporative emissions
• Refuelling emissions
• Test procedures
• Hybrid Electric Vehicle (HEV) test procedure

Emissions limits

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Optional low NO_X 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
• Future requirements

Current requirements

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Future requirements

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Historical Data

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• Evaporative Emissions
• On-board diagnostics - diesel
• On-board diagnostics - SI engines

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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