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Emissions legislation in California is the responsibility of the California Air Resources Board (CARB), which works closely with the equivalent federal body, the Environmental Protection Agency (EPA). California has special dispensation to establish its own exhaust emissions legislation and other states may choose between the legislative programmes of California or the Federal EPA. Standards for large spark ignition engines are more stringent than the Tier 2 requirements applicable at Federal level; in-use fleet requirements are also in place for these engines. For new small (below 19 kW) non-road SI engines and for recreational vehicle engines, California has established emissions standards which are also more stringent than those of the EPA, but using the same test procedures.

Non-road diesel engines

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• Overview
• Tier 4
• Smoke
• Crankcase emissions
• Transport refrigeration units
• Test procedures

Overview

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Tier 4

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Smoke

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Crankcase emissions

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Transport refrigeration units

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Test procedures

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Non-road large SI engines

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• Emissions requirements
• Evaporative emissions
• In-use requirements

Emissions requirements

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Evaporative emissions

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In-use requirements

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Non-road small SI engines

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• Overview
• Emissions limits
• Evaporative emissions requirements
• Test procedures

Overview

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Emissions limits

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Evaporative emissions requirements

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Test procedures

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Recreational vehicles

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• Overview
• Emissions limits
• Evaporative emissions
• Test procedures - Off-road motorcycles and ATVs

Overview

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Emissions limits

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Evaporative emissions

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Test procedures - Off-road motorcycles and ATVs

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Historical Data

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• Diesel engines -Tier 4 phase-in
• Diesel engines - Tiers 1 to 3

Diesel engines -Tier 4 phase-in

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Diesel engines - Tiers 1 to 3

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References

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