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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. Updated emissions standards, which will apply for model years 2024 and after, have been issued in final form.
Contents overview
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Vehicle categories
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New emissions standards - from 2024
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Overview
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New emissions standards - diesel engines
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Emissions limits
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Idling requirements
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Useful life values
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New emissions standards - Otto-cycle engines
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Emissions limits
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Useful life values
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New emissions standards - Test Procedures
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Diesel engines
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Otto-cycle engines
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New in-use testing programme
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Diesel engine vehicles
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Otto-cycle engine vehicles
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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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Advanced Clean Trucks Regulation
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Overview
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Deficits calculation
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Credits calculation
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Compliance with the regulation
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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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