EMLEG Database

California - Non-road Engines & Vehicles - 2

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CARB (the California Air Resources Board) is currently developing Tier 5 emissions standards for non-road diesel engines. Updated emissions standards for small SI engines, that apply from MY 2024, have been published, these will see transition to zero-emissions performance over time.

Contents overview

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Non-road diesel engines - proposed Tier 5 emissions standards

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Overview

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Emissions limits

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Family emissions limits

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Low load cycle emissions limits

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Greenhouse gas emissions limits

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Provisions for hydrogen engines

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In-use testing

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On-board diagnostics

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Small SI engines - from MY 2024

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Overview and details of the regulations

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Emissions limits and compliance requirements

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Averaging, banking and trading programme - exhaust emissions

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Evaporative emissions requirements

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Averaging, banking and trading programme - evaporative emissions

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References

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Last update: 13/06/2025