Skip to main content
U.S. flag

An official website of the United States government

Here’s how you know

Dot gov

Official websites use .gov
A .gov website belongs to an official government organization in the United States.

HTTPS

Secure .gov websites use HTTPS
A lock (LockA locked padlock) or https:// means you’ve safely connected to the .gov website. Share sensitive information only on official, secure websites.

    • Environmental Topics
    • Air
    • Bed Bugs
    • Cancer
    • Chemicals, Toxics, and Pesticide
    • Emergency Response
    • Environmental Information by Location
    • Health
    • Land, Waste, and Cleanup
    • Lead
    • Mold
    • Radon
    • Research
    • Science Topics
    • Water Topics
    • A-Z Topic Index
    • Laws & Regulations
    • By Business Sector
    • By Topic
    • Compliance
    • Enforcement
    • Laws and Executive Orders
    • Regulations
    • Report a Violation
    • Environmental Violations
    • Fraud, Waste or Abuse
    • About EPA
    • Our Mission and What We Do
    • Headquarters Offices
    • Regional Offices
    • Labs and Research Centers
    • Planning, Budget, and Results
    • Organization Chart
    • EPA History

Breadcrumb

  1. Home
  2. Regulations for Emissions from Vehicles and Engines

Final Rule for Control of Emissions of Hazardous Air Pollutants From Mobile Sources: Default Baseline Revision

Final Rule for Control of Emissions of Hazardous Air Pollutants From Mobile Sources: Default Baseline Revision
Basic Information
Code of Federal Regulations Citations
  • 40 CFR Part 80
Docket Numbers
  • EPA-HQ-OAR-2002-0042

On this page:

  • Rule Summary
  • Rule History
  • Additional Resources

Rule Summary

This action revises the mobile source air toxics (MSAT) rule default baseline values for reformulated gasoline and conventional gasoline to reflect the national average toxics performance of gasoline during 1998–2000. EPA’s MSAT rule, Control of Emissions of Hazardous Air Pollutants From Mobile Sources (66 FR 17230, March 29, 2001), requires that the annual average toxic performance of gasoline must be at least as clean as the average performance of the gasoline produced or imported during the period 1998–2000 (known as the ‘‘baseline period’’).

  • Final Rule (pdf) (168 KB, published October 6, 2005)

Rule History

Related Rules
  • Final Rule for Control of Emissions of Hazardous Air Pollutants From Mobile Sources - 40 CFR Parts 80 and 86

Proposed Rule and Related Materials

This rule proposed revisions to default baseline values for reformulated gasoline and conventional gasoline under EPA’s mobile source air toxics (MSAT) program.

  • Proposed Rule (pdf) (164 KB, published January 4, 2005)

Additional Resources

  • Fact Sheet: Final Rulemaking to Revise MSAT Default Baseline Values (pdf) (37.0 KB, EPA420-F-05-034, September 2005)

Regulations for Emissions from Vehicles and Engines

  • Onroad
    • Passenger Vehicles
    • Commercial Trucks & Buses
    • Motorcycles
  • Nonroad
    • Aircraft
    • Heavy Equipment
    • Locomotives
    • Marine
    • Recreational Vehicles
    • Small Equipment & Tools
  • 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 13, 2025
  • Assistance
  • Spanish
  • Arabic
  • Chinese (simplified)
  • Chinese (traditional)
  • French
  • Haitian Creole
  • Korean
  • Portuguese
  • Russian
  • Tagalog
  • Vietnamese
United States Environmental Protection Agency

Discover.

  • Accessibility Statement
  • Budget & Performance
  • Contracting
  • EPA www Web Snapshot
  • Grants
  • No FEAR Act Data
  • Plain Writing
  • Privacy
  • Privacy and Security Notice

Connect.

  • Data
  • Inspector General
  • Jobs
  • Newsroom
  • Regulations.gov
  • Subscribe
  • USA.gov
  • White House

Ask.

  • Contact EPA
  • EPA Disclaimers
  • Hotlines
  • FOIA Requests
  • Frequent Questions
  • Site Feedback

Follow.