New Source Review Permitting Improvement Act
- Sponsor
- Sen. Husted, Jon [R-OH]
- Committees
- Environment and Public Works Committee (primary)
- Last action
- Aug 7, 2026
Bottom line
The bill aims to reduce regulatory burdens and streamline permitting for industrial facilities by narrowing the scope of activities that trigger New Source Review requirements under the Clean Air Act.
What it actually does
This bill amends the Clean Air Act to redefine what constitutes a 'modification' or 'construction' at stationary sources, thereby altering when facilities must undergo stringent New Source Review (NSR) permitting. It clarifies that a modification only occurs if the maximum hourly emission rate of a pollutant increases, and exempts certain projects like pollution control, efficiency, safety, or reliability improvements unless they cause an adverse effect on human health or the environment. It also narrows the definition of 'construction' to physical construction of discrete parts of an emissions unit, and exempts changes not resulting in a significant annual actual emissions increase.
Proponents argue
Proponents argue that the current New Source Review program is overly burdensome, discourages facility modernization, and creates disincentives for companies to invest in pollution control technologies or efficiency upgrades due to the risk of triggering costly and time-consuming permitting processes. They contend this bill will foster economic growth, encourage investment in cleaner technologies, and improve the safety and reliability of industrial operations without compromising environmental protection.
Opponents contend
Opponents contend that this bill would significantly weaken the Clean Air Act's ability to prevent increases in air pollution, particularly in areas already struggling with air quality. They argue that shifting the definition of 'modification' to maximum hourly rates and exempting certain projects could allow facilities to increase overall annual emissions without proper oversight, leading to adverse public health and environmental impacts.
The bill is short and relatively accessible, but understanding its full implications requires familiarity with existing Clean Air Act regulations and New Source Review, which may take additional research time.
Section 2
Clarification of Definition of a Modification: Emission Rate Increases, Pollution Control, Efficiency, Safety, and Reliability Projects
This section amends section 111(a)(4) of the Clean Air Act. It specifies that a 'modification' (which triggers New Source Review) only occurs if the maximum hourly emission rate of an air pollutant achievable after a change is higher than the maximum hourly rate achievable during any hour in the preceding 10 years. Furthermore, it explicitly exempts changes designed to reduce emissions per unit of production or to restore, maintain, or improve reliability or safety, unless the Administrator determines such a change would cause an adverse effect on human health or the environment.
Supporters argue
Proponents argue that defining 'modification' by maximum hourly rates provides a clearer, more predictable standard for industry, encouraging investment in modernizing facilities and implementing efficiency or pollution control technologies without fear of triggering costly and time-consuming permitting. They believe the exemptions for safety and reliability projects are essential for maintaining critical infrastructure.
Critics contend
Opponents contend that focusing on maximum hourly rates rather than annual actual emissions creates a loophole, allowing facilities to significantly increase their total annual pollution output without triggering review. They argue that the exemptions, even with the Administrator's determination clause, could lead to a net increase in emissions and undermine the Clean Air Act's protective intent.
Tradeoffs
This provision balances the desire to reduce regulatory hurdles for industrial upgrades and maintenance against the goal of preventing increases in air pollution. The tension lies in whether the new definitions adequately protect public health and the environment while fostering economic activity.
Section 3
Clarification of Definition of Construction and Applicability of Preconstruction Requirements for Prevention of Significant Deterioration
This section amends sections 165 and 169(2) of the Clean Air Act, which govern the Prevention of Significant Deterioration (PSD) program. It clarifies that preconstruction requirements for major emitting facilities apply only to 'physical construction of the discrete parts of an emissions unit,' regardless of other costly or permanent on-site activities. It also states that for PSD purposes, 'construction' includes a modification (as defined in section 111(a)) but specifically excludes changes that do not result in a significant emissions increase or a significant net emissions increase in annual actual emissions.
Section 4
Clarification of Definition of Modifications and Modified and Applicability to Construction for Nonattainment Areas
This section amends sections 171 and 172(c)(5) of the Clean Air Act, which apply to nonattainment areas (areas that do not meet national ambient air quality standards). It redefines 'modifications' and 'modified' for these areas to align with section 111(a), but explicitly excludes changes that do not result in a significant emissions increase or a significant net emissions increase in annual actual emissions. It also clarifies that construction requiring a permit in nonattainment areas is limited to 'physical construction of the discrete parts of an emissions unit,' similar to the PSD changes.
Defines an increase in the amount of any air pollutant emitted by a source as occurring 'only if the maximum hourly emission rate of an air pollutant that is achievable by such source after the change is higher than the maximum hourly emission rate of such air pollutant that was achievable by such source during any hour in the 10-year period immediately preceding the change.'
Section 2, paragraph (2)
Why it matters:This is a highly technical but substantively crucial change to how emissions increases are measured. Its placement is standard for statutory amendments but its technical nature makes its full impact easy to overlook for a casual reader.
Case for: Proponents argue this provides a clear, objective, and predictable metric for determining when a modification has occurred, reducing ambiguity and litigation compared to subjective 'actual emissions' calculations. It allows facilities to operate at higher capacities without triggering review, provided their peak hourly rates don't exceed historical highs.
Case against: Opponents argue that focusing solely on maximum hourly rates, especially against a 10-year historical peak, could allow facilities to significantly increase their overall annual emissions and operating hours without triggering New Source Review. This could lead to substantial increases in total pollution burden, particularly if a facility previously operated at lower utilization rates.
Estimated impact: This redefinition fundamentally alters the trigger for New Source Review, potentially reducing the number of projects subject to review and allowing for greater overall annual emissions from some facilities.
Defines 'emissions unit' as 'any part of a stationary source that emits, or has the potential to emit, any air pollutant that is regulated under this title.'
Section 3(f)(2)
Why it matters:This is a standard definitional clause, but the precise scope of 'emissions unit' is critical for determining what constitutes 'physical construction of the discrete parts of an emissions unit' and thus what triggers PSD review. Its placement is typical for a definition.
Case for: Proponents argue this definition is clear and consistent, helping to delineate the specific components of a facility that are subject to regulation, thereby providing clarity for industry and regulators.
Case against: Opponents might argue that a narrow interpretation of 'emissions unit' could allow for significant changes to other parts of a stationary source that indirectly lead to emissions increases without triggering review, effectively creating a loophole.
Estimated impact: The interpretation and application of this definition will directly influence the scope of projects subject to PSD preconstruction review.
States that 'Nothing in this Act or the amendments made by this Act shall be construed to treat any change as a modification for purposes of any provision of the Clean Air Act (42 U.S.C. 7401 et seq.) if such change would not have been so treated on the day before the date of enactment of this Act.'
Section 5
Why it matters:Rules of construction are often placed at the end of bills to clarify legislative intent or prevent unintended interpretations. While standard, its legal implications could be significant and easily missed by a non-legal reader.
Case for: Proponents would argue this clause ensures the bill does not inadvertently broaden the scope of 'modification' in any unforeseen way, providing a safeguard against unintended regulatory expansion.
Case against: Opponents might argue that this clause could be interpreted to limit the effectiveness of the new definitions in certain contexts, or create ambiguity by referencing prior interpretations, potentially leading to litigation.
Estimated impact: This provision aims to prevent the bill from being interpreted to increase regulatory burdens beyond existing law, potentially serving as a legal defense against such claims.