Analyst Brief April 10, 2026

H.R. 6409 — FENCES Act

Executive Summary

Under the Clean Air Act, states can face severe penalties and permitting gridlock for failing to meet National Ambient Air Quality Standards (NAAQS), even when the pollution originates outside the U.S. H.R. 6409, the FENCES Act, amends the Clean Air Act to ensure that all foreign emissions—regardless of whether they result from human activity—are excluded from attainment determinations. Driven by Republican concerns over unfair sanctions and economic stagnation, the bill provides a mechanism for states to avoid nonattainment designations and associated fees if they can prove their air quality issues are caused by foreign emissions, exceptional events, or uncontrollable mobile sources.

Arguments For

  • Economic & Permitting Relief: Prevents states from facing crippling economic sanctions and permitting gridlock due to pollution they cannot control, such as cross-border smog or international wildfires.
  • Regulatory Fairness: Ensures states are only held accountable for emissions within their jurisdictional control, rather than being penalized for global or natural phenomena.

Likely Supporters

RepublicansU.S. Chamber of CommerceAmerican Forest & Paper AssociationState Environmental Agencies

Arguments Against

  • Public Health Risks: Democrats argue this creates a massive loophole allowing states to artificially classify polluted areas as 'in attainment,' masking poor air quality and exacerbating health risks.
  • Evasion of Accountability: Opponents contend the bill allows states to avoid implementing necessary local emissions controls, permitting new polluting facilities to be built without adequate safeguards.

Likely Opponents

DemocratsNatural Resources Defense Council (NRDC)Environmental Advocacy GroupsPublic Health Organizations

📋 Key Provisions

  • Clarifies that emissions emanating from outside the United States, regardless of whether they result from human activity, are excluded from Clean Air Act nonattainment determinations.
  • Prohibits the EPA from designating an area as nonattainment for new or revised NAAQS if the state proves it would meet the standard but for foreign emissions.
  • Exempts states from sanctions and fees for Severe/Extreme ozone or Serious particulate matter nonattainment if the failure is due to foreign emissions, exceptional events, or uncontrollable mobile sources.
  • Requires states to renew their demonstration of uncontrollable emissions at least once every 5 years to maintain the exemption from sanctions.

Supporting Views on Legislation

Under the Clean Air Act, states can be penalized for failing to meet National Ambient Air Quality Standards (NAAQS) due to foreign emissions beyond their control. H.R. 6409 amends the Act to ensure that all foreign emissions, regardless of whether they result from human activity, are excluded from attainment determinations, preventing states from facing unfair sanctions and permitting gridlock.

⚖️ Dissenting views on legislation

Committee on Energy and Commerce: The minority strongly opposes the bill, arguing it creates a dangerous loophole that allows states to ignore international pollution and avoid accountability for poor air quality. They contend the legislation would artificially classify polluted areas as in attainment, exacerbating public health risks and allowing new polluting facilities to be built without necessary emissions controls.

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Claim Analysis Page 3, Line 11

Excludes foreign emissions regardless of whether they result from human activity.

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"(regardless of whether such emissions"

Claim Analysis Page 4, Line 4

Prohibits nonattainment designation if failure is due to foreign emissions.

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"standard for such pollutant but for emissions emanating"

Claim Analysis Page 5, Line 5

Exempts areas from sanctions/fees for uncontrollable mobile sources.

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"Emissions from mobile sources to the ex-"

Claim Analysis Page 5, Line 25

Requires renewal of the demonstration every 5 years.

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"at least once every 5 years"