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USA Clean Air Act

USA Clean Air Act: Establishes enforceable emission standards, permitting regimes and performance-based controls for stationary and mobile sources

Maílis Carrilho
Written by Maílis Carrilho
Updated on February 26th, 2026

Summary

The Clean Air Act (CAA) provides the Environmental Protection Agency with the authority to regulate greenhouse gases as air pollutants. Following Supreme Court precedent, EPA uses performance standards, permitting programs, and emissions monitoring requirements to regulate power plants, refineries, oil and gas facilities, and vehicles. The framework imposes binding emission limits and compliance obligations on major sources nationwide.

Details

Jurisdictions
  • The United States of America (USA)
Mandatory for

Applies to major sources exceeding statutory thresholds.

Exemptions

Small emitters are typically excluded from PSD/Title V.

Deep dive

2 min read
Published Feb 26, 2026

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What’s Required

GHG regulation under the CAA is implemented through multiple statutory pathways.

1. Section 111 – New Source Performance Standards (NSPS)

EPA establishes:

  • Standards for new and modified sources.

  • Emission performance rates.

  • Best System of Emission Reduction determinations.

Affected facilities must:

  • Install compliant control technologies.

  • Conduct performance testing.

  • Maintain monitoring systems.

  • Submit periodic compliance reports.

2. Prevention of Significant Deterioration (PSD)

Major new sources and major modifications must:

  • Obtain PSD permits.

  • Conduct Best Available Control Technology analysis.

  • Model air quality impacts.

  • Provide public notice.

Operating without a PSD permit is unlawful.

3. Title V Operating Permits

Major sources must:

  • Maintain comprehensive operating permits.

  • Include all applicable GHG requirements.

  • Certify compliance annually.

Title V violations trigger enforcement risk independent of emissions exceedance.

4. Section 202 – Mobile Source Standards

EPA sets GHG emission standards for light-duty and heavy-duty vehicles.

Manufacturers must:

  • Certify fleet compliance.

  • Conduct emissions testing.

  • Maintain records.

Non-compliant vehicles cannot be sold in U.S. commerce.

5. Monitoring, Reporting, and Recordkeeping

Facilities must:

  • Install Continuous Emissions Monitoring Systems where required.

  • Maintain deviation logs.

  • Submit periodic compliance certifications.

Failure to monitor is a standalone violation.

Important Deadlines

  • Clean Air Act was enacted in 1970; major amendments were made in 1990.

  • GHG regulation affirmed the 2007 Supreme Court decision.

  • Rule-specific compliance deadlines vary.

PSD permits are required before construction.

Current Status

In force. EPA continues issuing GHG performance standards. Litigation is common but does not suspend compliance unless court-ordered.

Penalties for Non-Compliance

  • Civil penalties exceeding $100,000 per day per violation (inflation-adjusted)

  • Injunctive relief.

  • Supplemental Environmental Projects.

  • Criminal prosecution for knowing violations.

  • Citizen suits.

Examples of Known Violations

  • Operating without a PSD permit.

  • Failure to install required control technology.

  • Exceeding emission limits.

  • False certification of compliance.

Resources


Maílis Carrilho
Added by:
Maílis Carrilho
Sustainability Research Analyst
Maílis Carrilho is a Sustainability Research Analyst (Intern) at Net Zero Compare, contributing research and analysis on climate tech, carbon policies, and sustainable solutions. She supports the team in developing fact-based content and insights to help companies and readers navigate the evolving sustainability landscape.
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Added on Feb 26, 2026 by Maílis Carrilho ·