Clean Air Act

Delaware House Passes HB 402 To Extend Title V Operating Permit Fees For 2027–2029

Delaware’s House has passed HB 402, advancing a bill that would extend and restructure Clean Air Act Title V operating permit fees for in-state facilities for calendar years 2027–2029. If the Senate also approves the bill and it is signed, major Title V sources in Delaware face higher and more granular annual fee obligations from 2027, so environmental and finance teams should budget for increased programme costs and closely track the remaining legislative steps.

25 May 2026, 15:34legis.delaware.govUnited States

Delaware House Passes HB 402 To Extend Title V Operating Permit Fees Through 2029

Delaware's House has passed HB 402, a bill that would extend Clean Air Act Title V operating permit fees through 2029 and update the base, user, and programme fee structure for Title V sources from 2027 onward. If the bill is enacted, Title V facilities in Delaware will face continued fee obligations under an adjusted fee schedule and should factor the extended 2027–2029 horizon into budget, permitting, and compliance planning.

24 May 2026, 21:22legis.delaware.govUnited States

Oklahoma DEQ Opens Public Comment on 2026 Draft SO2 Annual Report

Oklahoma’s environmental regulator is inviting public comment on the draft 2026 SO2 air-quality report for four major sources under the 2010 primary SO2 NAAQS, with submissions due by 22 June 2026. Facilities and advisors should review the modeled emissions and inventory data now to confirm it accurately reflects operations and to flag any data or modeling issues before the report is finalised.

24 May 2026, 21:07oklahoma.govUnited States

Michigan House Refers HB 5557 on Emission Inventory Calculation to Second Reading

On 21 May 2026, the Michigan House advanced HB 5557 to second reading, proposing to amend state air pollution law so that emission inventory calculations use the longest averaging period allowed under the Clean Air Act. If enacted, this would standardise how emission profile data are calculated for Michigan facilities and could affect emissions reporting metrics and compliance planning for air-permitted operations in the state.

24 May 2026, 21:04legislature.mi.govUnited States

US House Draft FY27 Interior and Environment Bill Would Cut EPA Funding by Nearly 20%

In May 2026, the US House Interior and Environment Appropriations Subcommittee chair outlined a draft FY27 spending bill that would cut EPA funding by nearly 20% while maintaining major water-infrastructure grants, tribal health and education funding, and expanded support for domestic energy and critical minerals. If enacted, this package would tighten resources for EPA regulatory programmes even as it prioritises state and tribal water projects, wildland firefighting, and resource extraction, signalling potential medium-term shifts in US environmental enforcement capacity and policy direction.

23 May 2026, 11:16appropriations.house.govUnited States

US EPA Approves Arizona Gila County RACT SIP for 2015 Ozone NAAQS

In May 2026, the US EPA approved Arizona’s 2025 state implementation plan revision demonstrating reasonably available control technology for ozone precursors in the Gila County portion of the Phoenix–Mesa nonattainment area, with the rule taking effect on 22 June 2026. This makes ADEQ’s RACT analysis and extensive negative declarations for VOC and NOx source categories federally enforceable, giving operators greater certainty on current control expectations while shaping how future sources and permits will be evaluated under the Clean Air Act.

23 May 2026, 11:16federalregister.govUnited States

Texas TCEQ Opens NTIG Applications for Stationary Emissions-Reduction Projects — $16.5 Million Available Statewide

Texas environmental regulators have opened 2026 NTIG grant applications, making $16.5 million available statewide to co-fund emissions-reduction technologies at stationary sources, with applications due by 25 September 2026. The programme supports major investments in renewable energy storage, stationary-source controls and oil and gas emissions reductions, helping Texas operators cut regulated air pollutants while offsetting capital costs and managing future compliance risk.

22 May 2026, 18:53tceq.texas.govUnited States

Virginia DEQ Opens Comment Period on Draft Title V Permit for Butcher Creek Sanitary Landfill (Reg. No. 32071)

Virginia DEQ has opened a 20 May–22 June 2026 public comment period on a draft renewal Title V air permit for the Butcher Creek municipal solid waste landfill in Mecklenburg County, Virginia. The decision will fix the facility’s Clean Air Act obligations for the next permit term, including NMOC monitoring and potential future gas control requirements, so operators and nearby stakeholders should review conditions now and decide whether to comment.

22 May 2026, 16:50deq.virginia.govUnited States

US EPA Proposes Approval of Florida SIP Changes on Emissions Reporting and Permitting Forms

EPA has proposed to approve a Florida air plan revision that updates emissions reporting deadlines, streamlines which permitting forms are incorporated into the State Implementation Plan, and removes an administrative permit-correction rule from the SIP under the Clean Air Act. If finalised, the changes would mainly adjust reporting calendars and SIP-referenced forms for stationary sources in Florida, so affected facilities should confirm how their annual operating reports and permitting paperwork align with the revised framework and consider commenting by 22 June 2026.

22 May 2026, 16:46federalregister.govUnited States

Virginia DEQ Seeks Public Comment on Draft Federal Operating Permit Renewal for Buckeye Terminals, LLC – Fairfax Terminal (Reg. No. 70220)

Virginia’s Department of Environmental Quality has opened an April–May 2026 public comment period on a draft federal (Title V) operating permit renewal for Buckeye Terminals’ major-source petroleum storage terminal in Fairfax, Virginia. Although the draft permit does not increase allowable emissions, it will define the facility’s future air‑permitting, monitoring, and leak‑control obligations under the U.S. Clean Air Act, so operators and local stakeholders may wish to review conditions and engage in the comment and EPA review process.

22 May 2026, 16:44deq.virginia.govUnited States

US Senate Receives H.R. 1346 on Year-Round E15 and RFS Small Refinery Reforms

In May 2026, the US Senate received H.R. 1346 on year‑round E15 gasoline and Renewable Fuel Standard (RFS) small refinery reforms, following House passage and referral to the Senate Committee on Environment and Public Works. If enacted, the bill would cement nationwide year‑round E15 sales, sharply narrow and retarget RFS relief for small refineries, and force fuel producers, refiners, and retailers to adjust compliance strategies, infrastructure upgrades, and RIN credit management under the Clean Air Act and RCRA.

20 May 2026, 09:59govinfo.govUnited States

EPA Partially Disapproves Hawaii’s Regional Haze Plan and Ensures the State’s Energy Needs Continue to Be Met

In May 2026, the US Environmental Protection Agency issued a final action partially approving and partially disapproving Hawaii’s 2024 Regional Haze air-quality plan, blocking premature unconsented closure deadlines for several fuel oil power units at critical plants. Hawaii must now revise its plan or face a federal implementation plan within roughly two years, making regional haze compliance and grid reliability a near-term strategic priority for state regulators and affected generators.

19 May 2026, 21:27epa.govUnited States

Iowa DNR Posts New Title V Draft Air Permits and Enforcement Actions

On 14 May 2026, Iowa’s Department of Natural Resources opened public comment on new Title V air permits for ADM’s Des Moines soybean facility and Bridgestone’s Des Moines tyre plant, and simultaneously published a batch of recent environmental enforcement orders. These developments signal sustained regulatory scrutiny of major industrial emitters in Iowa, with near-term comment deadlines and visible penalties underscoring the need for strong air and water compliance programmes at similar facilities.

19 May 2026, 21:10iowadnr.govUnited States

US EPA Proposes Two-Year Delay to Tier 4 Criteria Pollutant Phase-In for Light- and Medium-Duty Vehicles

EPA has proposed to revise the Tier 4 criteria pollutant programme by extending existing Tier 3 emission standards for US light- and medium-duty vehicles through model years 2027 and 2028, delaying the start of Tier 4 criteria pollutant standards to model year 2029. This would temporarily ease near-term criteria pollutant compliance pressure for vehicle manufacturers and importers while EPA reconsiders the longer-term Tier 4 standards, phase-in schedule and test procedures in a planned second rulemaking.

18 May 2026, 13:28public-inspection.federalregister.govUnited States

Oregon EQC Temporarily Aligns Summer Fuel Standards With EPA E15 Waivers

In May 2026, Oregon’s Environmental Quality Commission temporarily aligned state summertime fuel standards with EPA Clean Air Act waivers, allowing optional E15 and higher-volatility gasoline sales during the 2026 summer waiver period. Fuel suppliers and retailers in Oregon gain short-term flexibility to sell E15 while avoiding conflicting state and federal rules, but should closely track further EPA and DEQ decisions this summer as waiver periods and fuel requirements may change quickly.

16 May 2026, 14:48apps.oregon.govUnited States

Virginia DEQ Seeks Comment On Draft Title V Permit Renewal For Philip Morris Park 500 Complex (PRO50722)

Virginia DEQ has opened a mid-May to mid-June 2026 public comment period on renewing the federal Title V air operating permit for Philip Morris USA’s Park 500 tobacco manufacturing complex, with no changes proposed to existing emission limits. The renewal would keep the facility permitted as a major source of NOx, SO2 and VOCs under the US Clean Air Act, so operators, neighbours and investors may wish to review whether current caps, controls and monitoring remain adequate in light of evolving air-quality and ESG expectations.

15 May 2026, 17:43deq.virginia.govUnited States

US EPA Delegates Sewage Sludge Incineration Federal Plan to Northwest Clean Air Agency (Washington)

In May 2026, the US Environmental Protection Agency delegated implementation and enforcement of the existing sewage sludge incineration Federal Plan to the Northwest Clean Air Agency for facilities in Island, Skagit, and Whatcom Counties in Washington State. SSI operators in these counties keep the same emission and control requirements, but local administration by NWCAA will shape how permitting, inspections, and enforcement are managed going forward.

15 May 2026, 16:22federalregister.govUnited States

US House Passes H.R. 1346 on Year-Round E15 and RFS Small Refinery Reforms

In May 2026, the US House passed H.R. 1346, a Clean Air Act amendment package expanding year-round E15 gasoline sales and restructuring Renewable Fuel Standard obligations and exemptions for small refineries and small refining companies. If enacted, this would ease compliance barriers to higher-ethanol gasoline while capping broad small-refinery waivers, tightening transparency, and directing EPA to update infrastructure and labelling rules, shifting medium-term compliance strategy for fuel producers and blenders.

15 May 2026, 16:21govinfo.govUnited States

US EPA Proposes Two-Year Delay of Tier 4 Vehicle Criteria Pollutant Standards Until Model Year 2029

In May 2026, the US Environmental Protection Agency proposed a Part 1 rule to delay implementation of its Tier 4 criteria pollutant standards for light- and medium-duty vehicles from model year 2027 to 2029, keeping existing Tier 3 controls in place for 2027–2028. If adopted, this would ease near-term emissions compliance pressure and capital spending for US vehicle manufacturers and importers, but firms should plan for a later Part 2 review that could further revise Tier 4 stringency, timing, and testing requirements.

15 May 2026, 15:26epa.govUnited States

US Congress Introduces H.R. 8782 To Classify Municipal Snow Removal Vehicles As Emergency Vehicles Under the Clean Air Act

US lawmakers have introduced H.R. 8782 to amend the Clean Air Act so that dedicated-use municipal snow removal vehicles and machinery are explicitly treated as emergency vehicles within the law’s covered fleet definition. If this proposal advances, municipalities and fleet operators in snow-prone areas may need to reassess how such vehicles are planned for, classified, and managed under federal clean-air fleet requirements.

15 May 2026, 15:19congress.govUnited States