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  2. Regulations for Emissions from Vehicles and Engines

Final Rule for Revised Carbon Monoxide (CO) Standard for Class I and II Nonhandheld New Nonroad Phase 1 Small Spark-Ignition Engines

Final Rule for Revised Carbon Monoxide (CO) Standard for Class I and II Nonhandheld New Nonroad Phase 1 Small Spark-Ignition Engines
Basic Information
Code of Federal Regulations Citations
  • 40 CFR Part 90

On this page:

  • Rule Summary
  • Rule History

Rule Summary

This rule revises the Phase 1 carbon monoxide (CO) emission standard for Class I and II new nonroad spark-ignition (SI) engines at or below 19 kilowatts. The action increases the CO standard from 469 grams per kilowatt-hour (g/kW-hr) to 519 g/kW-hr. This action addresses the CO emission difference between oxygenated and nonoxygenated fuels that was not reflected when the Agency previously set the CO standard for these nonhandheld engines in a final rule published July 3, 1995.

  • Final Rule (PDF)(6 pp, 138 K, published November 13, 1996, About PDF)

Rule History

  • Proposed Rule and Related Materials

Regulations for Emissions from Vehicles and Engines

  • Onroad
    • Passenger Vehicles
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  • Nonroad
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  • Greenhouse Gas
Contact Us About Regulations for Emissions from Vehicles and Engines
Contact Us About Regulations for Emissions from Vehicles and Engines to ask a question, provide feedback, or report a problem.
Last updated on May 6, 2024
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