Nitrogen Oxides (NOx)

Illinois PCB Proposes Consolidated NAAQS Ambient Air Quality Standard Updates (2024–2025)

Illinois is moving to align state ambient air quality standards with recent federal US EPA updates for sulphur dioxide, nitrogen dioxide, and particulate matter, with final adoption targeted for March 2026. Affected operators must ensure monitoring protocols and data-handling procedures comply with the revised secondary SO2 standards and newly approved federal reference measurement methods.

9 Apr 2026, 10:17pcb.illinois.govUnited States

Netherlands Clarifies Steel-Slag Restrictions and Emission Reduction Commitments for Tata Steel

The Dutch government has clarified the enforcement of emergency restrictions on steel-slag building materials and the transition of Tata Steel's emission targets into binding, enforceable obligations. Companies in the construction and steel sectors must prepare for stricter monitoring requirements and a potential permanent shift in the regulatory framework for secondary building materials following the European Commission's review of national emergency measures.

6 Apr 2026, 16:13open.overheid.nlNetherlands

Australia DCCEEW Publishes 2024–25 National Pollutant Inventory Data

Australia has released the 2024–25 National Pollutant Inventory (NPI) dataset, detailing annual emissions and waste transfers for 93 substances across industrial facilities. While no new compliance obligations are introduced, businesses should use this data to benchmark environmental performance and manage reputational risks associated with public pollutant disclosures.

4 Apr 2026, 11:02dcceew.gov.auAustralia

Virginia DEQ Seeks Comment on Draft State Operating Permit for Clover Power Station (Reg. 30867)

Virginia DEQ is transitioning federal Consent Decree emission limits for SO2 and NOx into a permanent State Operating Permit for the Clover Power Station, with comments due by May 1, 2026. This move ensures long-term federal enforceability of existing air quality controls and fleet-wide emission caps as the facility transitions out of judicial oversight.

4 Apr 2026, 10:30deq.virginia.govUnited States

Netherlands Ministry of Health Answers Chemelot Health Questions and Plans Decision on National Biomonitoring Programme

The Dutch government will decide on a national chemical biomonitoring programme by summer 2026 to address public health concerns around major industrial clusters. This initiative, alongside new frameworks for assessing industrial health costs, signals a long-term shift toward stricter emission controls and enhanced liability risks for chemical manufacturers.

3 Apr 2026, 09:56open.overheid.nlNetherlands

Pennsylvania DEP Launches Delaware County Air Monitoring Online Dashboard

Pennsylvania DEP has launched a real-time air monitoring dashboard for Delaware County’s industrial corridor, providing public access to localized PM2.5 and gas pollutant data. Increased data transparency in environmental justice areas signals heightened regulatory scrutiny and potential for localized enforcement or stricter permitting requirements for industrial operators.

2 Apr 2026, 08:25pa.govUnited States

Netherlands (RIVM) Publishes Exploratory Study On Air Pollution And Cancer Risk

A new RIVM study confirms links between long-term exposure to air pollutants like NO2 and particulate matter and increased risks of bladder and liver cancer. This evidence strengthens the case for stricter national air quality standards and may drive tighter emission controls for industrial operations and transport fleets.

1 Apr 2026, 14:40rivm.nlNetherlands

Australia: NSW EPA Consults On Updated Approved Methods For Modelling And Assessment Of Air Pollutants

The NSW EPA is consulting on major updates to air pollutant modelling and assessment methods through May 4, 2026, including a transition to the AERMOD dispersion model. Industrial operators should prepare for more stringent impact criteria and mandatory mitigation analyses that may complicate future licensing and operational expansions.

31 Mar 2026, 19:26yoursay.epa.nsw.gov.auAustralia

US EPA Issues Guidance Allowing NOx Sensors to Replace DEF Quality Sensors in Diesel Engines

The US EPA issued guidance on March 26, 2026, allowing diesel engine manufacturers to use NOx sensors instead of dedicated urea quality sensors (UQS) for DEF monitoring. This flexibility enables manufacturers to reduce engine shutdown risks caused by sensor failures and allows for fleet software updates without violating Clean Air Act anti-tampering provisions.

29 Mar 2026, 17:19epa.govUnited States

Netherlands Outlines Coherent Agriculture, Nature and Nitrogen Strategy With 2030/2035 Emission-Reduction Targets

The Dutch government has unveiled a comprehensive strategy to cut ammonia and nitrogen oxide emissions by 2030 and 2035, backed by a €20 billion investment envelope. Impacted sectors—including agriculture, industry, and mobility—face upcoming company-specific emission norms and stricter permitting requirements that will necessitate significant operational and technological adjustments.

29 Mar 2026, 17:08open.overheid.nlNetherlands

Colorado AQCC Adopts Regulation 7 on Oil and Gas Emissions (5 CCR 1001-9)

Colorado has finalized comprehensive updates to Regulation 7, mandating stricter VOC and methane controls across the oil and gas value chain effective April 2026. Operators must accelerate transitions to zero-emission pneumatic equipment and high-efficiency control devices to mitigate increasing regulatory and litigation risks associated with methane intensity.

28 Mar 2026, 20:28sos.state.co.usUnited States

UNECE Executive Body Publishes 2026–2027 Workplan for Implementation of the Convention

The UNECE has finalized its 2026–2027 workplan for the Convention on Long-range Transboundary Air Pollution, establishing the technical and policy priorities for the next biennium. This roadmap signals potential future revisions to emission protocols for VOCs, heavy metals, and persistent organic pollutants, necessitating long-term alignment of industrial operations and compliance strategies.

Netherlands Publishes Annex 6 Environmental Impact Report for Rotterdam Airport – Emissions and Air Quality

The Dutch government has released technical data on emissions and air quality as part of the environmental assessment for the Rotterdam Airport decision. This data forms the evidentiary basis for future operational restrictions and regional air quality compliance requirements.

27 Mar 2026, 18:38zoek.officielebekendmakingen.nlNetherlands

Netherlands Publishes MKBA For Rotterdam The Hague Airport Decree Alternatives

The Dutch government has published a social cost-benefit analysis (MKBA) evaluating future capacity and environmental scenarios for Rotterdam The Hague Airport. This assessment serves as a precursor to formal operational restrictions, signaling potential caps on flight volumes and stricter noise limits for aviation and logistics operators.

27 Mar 2026, 18:38zoek.officielebekendmakingen.nlNetherlands

Netherlands Raad van State Upholds Ruling on HoST NOx Emissions and Nature Permit

The Dutch Council of State has upheld a ruling requiring stricter scientific proof for ultra-low NOx emission claims used to bypass nature permit requirements for industrial and energy installations. Operators and developers must now ensure that emission factors significantly below standard regulatory limits are supported by durable, real-world operational data to avoid project delays or permit revocations.

27 Mar 2026, 08:25deeplink.rechtspraak.nlNetherlands

Netherlands: Amended Parliamentary Motion On Restarting Nature Permit Issuance Using Nitrogen Emission Ceilings

The Dutch Parliament has requested a concrete plan by summer 2026 to restart nature permitting through the exploration of area-based nitrogen emission ceilings. This move aims to provide long-term legal certainty for industrial and agricultural operations currently stalled by persistent litigation and permitting backlogs.

27 Mar 2026, 08:24zoek.officielebekendmakingen.nlNetherlands

Netherlands Court Clarifies Tata Steel NOx Permit Research Condition 1.2.20.H.I and Dismisses Enforcement Request

A Dutch court ruling on 17 March 2026 confirms that environmental permit conditions requiring emission-reduction research are legally enforceable obligations for industrial operators. Companies must ensure that feasibility studies and reporting deadlines are managed as high-stakes compliance requirements to avoid enforcement actions and successful legal challenges by third parties.

26 Mar 2026, 19:26uitspraken.rechtspraak.nlNetherlands

Germany BGH Remands Diesel Defeat-Device Case on EG-FGV Damages (VIa ZR 529/22)

The German Federal Court of Justice has solidified the legal basis for vehicle buyers to seek damages for unlawful diesel defeat devices under national vehicle approval regulations. This ruling heightens financial and litigation risks for automotive manufacturers by facilitating compensation claims for negligent non-compliance with EU emissions standards.

26 Mar 2026, 19:08rechtsprechung-im-internet.deGermany

EPA Expedites Review of New Hampshire Petitions on Vehicle I/M Program and Ozone Transport Region Status

The EPA is fast-tracking the review of New Hampshire's request to repeal its vehicle emissions testing program and exit the Ozone Transport Region, with a final decision expected by late 2026. This move signals a potential reduction in regional compliance burdens for the automotive sector while highlighting shifts in state-level air quality management priorities.

26 Mar 2026, 12:25epa.govUnited States

Germany BGH Judgment Clarifies Liability for Diesel Defeat Devices (VIa ZR 526/23, 17 March 2026)

The German Federal Court of Justice narrowed the legal defenses for automakers in diesel emissions litigation, facilitating consumer claims for "difference-in-value" damages (March 2026). This ruling heightens financial and litigation risks for manufacturers by setting a high bar for proving an "unavoidable mistake of law" when using controversial emission-control strategies.

25 Mar 2026, 21:35rechtsprechung-im-internet.deGermany