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. Stationary Sources of Air Pollution

Proposal Documentation for Reclassification of Major Sources as Area Sources Under Section 112 of the Clean Air Act

On June 25, 2019, EPA proposed regulatory text that would implement the clear language of the Clean Air Act that allows major sources of hazardous air pollutants (HAP) to reclassify as area sources at any time provided they permanently reduce hazardous air emissions.  This action would provide a level of fairness and flexibility for sources that reduce hazardous air pollutant emissions below major source thresholds to reclassify as area sources and reduce regulatory burden.

Read the proposed rule. 

October 1, 2020, the U.S. Environmental Protection Agency (EPA) issued the final MM2A rule. See the final MM2A rule here Reclassification of Major Sources as Area Sources Under Section 112 of the Clean Air Act

Supporting  information for the proposed rule is available below. 

Regulatory Impact Analysis for the Proposed Reclassification of Major Sources as Area Sources under Section 112 of the Clean Air Act (PDF)(305 pp, 7 MB; updated June 27, 2019)
 
 
  • Fact Sheet: Reclassification of Major Sources as Area Sources Under Section 112 of the Clean Air Act (MM2A) Proposal (pdf) (184.55 KB, version updated July 3, 2019)
  • MM2A Proposal Cost Analysis Memo (pdf) (459.14 KB)
  • MM2A Proposal Cost Considerations Memo for 125 Percent Scenario (pdf) (121.42 KB, version updated July 16, 2019)
  • MM2A Proposal Emissions Analysis Memo (pdf) (929.17 KB, version updated July 16, 2019)

Stationary Sources of Air Pollution

  • Regulations
    • Industry Sector Groups
    • National Emission Standards for Hazardous Air Pollutants (NESHAP)
      • Area Source Standards
      • Risk and Technology Review Status
    • New Source Performance Standards
    • Good Neighbor Plan for the 2015 Ozone National Ambient Air Quality Standards
  • Small Business Assistance Program
Contact Us About Stationary Sources of Air Pollution
Contact Us to ask a question, provide feedback, or report a problem.
Last updated on February 3, 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.